A boy on rollerskates is travelling along at 8 m/s. He has a mass of 60 kg and is carrying his
school bag of mass 10 kg. He throws the bag directly forward at 20 m/s relative to the
ground. Calculate the boy's speed after throwing the bag forward?
Answer:
6m/s
Explanation:
the original momentum = mass x velocity = 8x (60+10) = 560
momentum after = mass x velocity of the school bag + mass x velocity of the boy = 10x20 + 60x A
200+60A = 560
A=6
A track consists spring launcher on one end. A spring which is compressed 0.5 m has a
spring constant of 25 N/m. A 0.05 kg ball is resting at the end of the spring. When
released, the spring pushes the ball down the track. It collides and sticks to a second
block of 0.05 kg at rest.
(a) The velocity of the first ball before the collision with the second ball is 11.18 m/s.
(b) The final velocity of the two balls after the collision is determined as 5.59 m/s.
Speed of the block when pushed by the spring
The speed of the block when pushed by the spring is calculated as follows;
K.E = Ux
¹/₂mv² = ¹/₂kx²
mv² = kx²
v² = kx²/m
v² = (25 x 0.5²)/0.05
v² = 125
v = 11.18 m/s
Final velocity of the two balls after the collisionThe velocity of the two balls after the collision is calculated as follows;
Pi = Pf
where;
Pi is initial momentum Pf is final momentumm1u1 + m2u2 = v(m1 + m2)
0.05(11.18) + 0.05(0) = v(0.05 + 0.05)
0.559 = 0.1v
v = 5.59 m/s
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What an object conveys about the important events, advancements, and people of a specific time period is called the
cultural significance.
historical anecdote.
historical significance.
cultural importance.
The information being conveyed by an object about the important events, advancements, and people of a specific time period is known as: C. historical significance.
What is historical significance?Historical significance can be defined as an information that is being conveyed by an artistic object about the important events, advancements, technology, phenomenon, and people that have existed and occurred over a specific time period
This ultimately implies that, historical significance refers to the information that an object conveys with respect to the important events, advancements, technology, and people of a specific time period.
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2. Use the pattern of charge distribution to draw the relative size of the atoms in the space below. Please fill out the table!!! thank you
Potassium will have the greatest atomic size because of its number of shells, followed by sodium which 1 valence electron compared to magnesium the same number of shells but 2 valence electrons.
Relative size of the atomsThe relative size of the atoms is determined from the number of shells and valence electron contained in the atom.
Sodium, 11 ----> 2, 8, 1
Magnesium, 12 ----> 2, 8, 2
Potassium, 19, -----> 2, 8, 8, 1,
Potassium will have the greatest atomic size because of its number of shells, followed by sodium which 1 valence electron compared to magnesium the same number of shells but 2 valence electrons.
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Two waves overlap producing a new wave that exhibits destructive interference. Which statement correctly describes the new wave?
A. It has a larger amplitude than the waves that overlapped to produce it.
B. It has deeper troughs than the waves that overlapped to produce it.
C. It has taller crests than the waves that overlapped to produce it.
D. It has a smaller amplitude than the waves that overlapped to produce it.
A new wave created by the destructive interference of two waves is produced. The new wave is accurately described in statement A. Its amplitude is greater than that of the waves that produced it.
What is the definition of destructive interference?Destructive interference happens when the maxima of two waves are 180° out of phase; a positive displacement of one wave is canceled exactly by a negative displacement of the other wave.
Two or more waves combining to produce a wave with a smaller displacement is called destructive interference.
Two waves overlap producing a new wave that exhibits destructive interference. It has a larger amplitude than the waves that overlapped to produce it.
Hence, statement A correctly describes the new wave.
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The resulting net force of an object is represented below.
→10 N
Which most likely represent the forces acting on the object?
↑ 63 N and ↓ 73 N
↑ 97 N and ↓ 87 N
← 63 N and → 73 N
← 97 N and → 87 N
The option which most likely represent the forces acting on the object is ← 63 N and → 73 N.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
When the resulting net force of an object is →10 N
The forces must be in x and -x direction to balance and give net force of 10 N in +x direction.
So, +73N -63 N = +10 N
Thus, the correct option is ← 63 N and → 73 N
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which change to an object would reduce its kinetic energy by half
Answer:
I don't really understood the question
What will be the final velocity of a 5.0 g bullet starting from rest, if a net force of 45 N is
applied over a distance of 0.80 m?
The net force performs a total amount of work equal to
(45 N) (0.80 m) = 36 J
on the bullet, and this is in turn is equal to the change in the bullet's kinetic energy by the work-energy theorem. So we have
W = ∆K = 1/2 mv²
since the bullet starts at rest, where m = its mass and v = its final velocity.
Solve for v :
36 J = 1/2 (0.0050 kg) v² ⇒ v = 120 m/s
John pulls a sled on a frictionless surface with a force of 60 N at an angle of 37o above the horizontal. If he pulls it a distance of 12 m, the work he does is: g
The work John does is 680 J (joules).
To calculate the work done by John, we need to use the formula:
Work = Force * Distance * cos(theta)
where Force is the applied force, Distance is the displacement, and theta is the angle between the force and the displacement.
Substitute the given values into the formula:
Force = 60 N
Distance = 12 m
theta = 37 degrees
Convert the angle from degrees to radians:
theta_radians = 37 degrees * (pi/180)
Calculate the cosine of the angle:
cos(theta_radians) = cos(37 degrees * (pi/180))
Calculate the work done by John:
Work = 60 N * 12 m * cos(37 degrees * (pi/180))
Simplify the equation and calculate the numerical value:
Work ≈ 680 J (joules)
Therefore, the work done by John is approximately 680 joules.
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Which times and distances are represented by the function? select three options. the starting distance, at 0 hours, is 300 miles. at 2 hours, the traveler is 725 miles from home. at 2.5 hours, the traveler is still moving farther from home. at 3 hours, the distance is constant, at 875 miles. the total distance from home after 6 hours is 1,062.5 miles.
The times and distances are represented by the function are
at 2 hours, the traveler is 725 miles from home. at 3 hours, the distance is constant, at 875 milesthe total distance from home after 6 hours is 1,062.5 miles.What is distance?The distance is the length of path travelled by a body when moving with some speed and taking time t.
Given function is
D (t) = 300t +125 for 0≤t<2.5
D (t) = 875 for 2.5 ≤t≤3.5
D(t)= 75t +612.5 for 3.5<t≤6
According to the given function, for 2 hours, the traveler will travel from home,
D (2) = 300x2 +125 = 725 miles.
For time between 2.5 to 3.5 hr, the distance is constant i.e. 875 miles.
For total time 6hr, the distance travelled will be
D(6) = 75 x 6 +612.5 = 1062.5 miles.
Thus, the correct options are picked up.
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Answer:
B, D, E
Explanation:
got it right on edge
The angular speed of a wheel of bicycle is 8pi rad/s what is period of rotation
I hope this woll work.Best of luck.Sorry of the answer ia wrong
Find the magnetic field (positive magnitude only, no direction) at point p. i1 = 12.0 a r1=2.40 m i2 = 10.0 a r2 = 1.25 m
The magnetic field (positive magnitude only, no direction) at point p is further explained below.
B=1.89*10^{-6}
What is the magnetic field (positive magnitude only, no direction) at point p.?Generally, the equation for magnetic field is mathematically given as
[tex]B= \frac{\mu0}{2\pi}*\frac{I1}{r1}[/tex]
Therefore
[tex]B1= \frac{2*10^{-7}(10)}{240}[/tex]
B1=1*10^{-6}T
and
[tex]B2= \frac{2*10^{-7}(10)}{1.25}[/tex]
B2=1*10^{-6}T
In conclusion,
[tex]B=\sqrt{B1^2+B2^2}[/tex]
B=1.89*10^{-6}
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Question 10 of 10
What is density?
A. The net energy transferred between two objects
B. A measure of mass per unit volume
OC. The force exerted on an area
OD. A measure of the movement of molecules
Answer:
B. A measure of mass per unit volume
Explanation:
trust me
Answer:ITS C I PASSED THE TEST
Explanation:I DID THE PLATO
when a metal sphere is dropped in to a tall cylinder containing liquid its acceleration is g÷2 (gravity over 2) show that : density of metal =2density of liquid
The density of the metal sphere is 2 times the density of the liquid as proved.
Net upward force acting on the metal sphereThe net upward force acting on the sphere as it is dropped into the liquid is calculated as follows;
F = σVg - ρVg
ma = σVg - ρVg
where;
ρ is density of the liquidσ is the density of the metala is acceleration of the metalσV(a) = σVg - ρVg
σ(a) = σg - ρg
σ(g/2) = σg - ρg
g(σ/2) = g(σ - ρ)
σ/2 = σ - ρ
σ/2 - σ = - ρ
-σ/2 = - ρ
σ = 2ρ --- proved
Thus, the density of the metal sphere is 2 times the density of the liquid as proved.
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A flywheel rotating at an initial velocity of 2.09 rad/s undergoes a change to 4.6 rad/s for precisely 5s
a) Calculate the angular acceleration of the flywheel.
b) Suppose the flywheel has moment of inertia of 1.5 kg m^2. Compute the wheels torque?
[Please answer if you know]
Answer:
A. 0.502
B. 0.753
Explanation:
A. The angular acceleration of the flywheel is equal to the change in angular velocity divided by the change in time, which is equal to (4.6-2.09)/5 which is 0.502.
B. Angular acceleration is equal to the net torque divided by the rotational inertia. If you rearrange the equation, torque is equal to angular acceleration times rotational inertia, which is 0.502 times 1.5 which is 0.753.
Answer:
Assumption: the angular acceleration of this flywheel is constant.
Angular acceleration: [tex]0.502\; {\rm rad\cdot s^{-2}}[/tex].
Net torque on this flywheel: [tex]0.753\; {\rm kg \cdot m^{2} \cdot s^{-2}[/tex] (or, equivalently, [tex]0.753\; {\rm N \cdot m}[/tex].)
Explanation:
Change in the angular velocity of this flywheel:
[tex]\begin{aligned}\Delta \omega &= \omega_{1} - \omega_{0} \\ &= 4.6\; {\rm rad \cdot s^{-1}} - 2.09 \; {\rm rad \cdot s^{-1}} \\ &= 2.51\; {\rm rad \cdot s^{-1}}\end{aligned}[/tex].
Divide this change in angular velocity [tex]\Delta \omega[/tex] with the duration [tex]t[/tex] of the acceleration to find the average angular acceleration of this flywheel:
[tex]\begin{aligned}\alpha &= \frac{\Delta \omega}{t} \\ &= \frac{2.51\; {\rm rad \cdot s^{-1}}}{5\; {\rm s}} \\ &= 0.502\; {\rm rad \cdot s^{-2}}\end{aligned}[/tex].
By Newton's Second Law for Rotation, the net torque on this flywheel would be the product of the angular acceleration and the moment of inertia of this flywheel, [tex]I[/tex]:
[tex]\begin{aligned}\tau_{\text{net}} &= I\, \alpha \\ &= 1.5\; {\rm kg \cdot m^{2}} \times 0.502\; {\rm s^{-2}} \\ &= 0.753\; {\rm kg \cdot m^{2} \cdot s^{-2}} \\ &= 0.753\; {\rm (kg \cdot m \cdot s^{-2}) \cdot m} \\ &= 0.753\; {\rm N \cdot m}\end{aligned}[/tex].
Choose the items that help to fully describe voltage.
Answer:
the easy way to describe this is to use a light as an example.
Explanation:
Voltage is pretty much the loop used to help use a lightbulb to emit light. Without voltage, we would be unable to use lightbulbs. This applies to much more than a lightbulb, but it's the easiest way to describe how voltage works.
On a hot day, the deck of a small ship reaches a temperature of 48
17.0°C seawater on the deck to cool it down. During the cooling, 3,710,000 J are transferred to the
seawater from the deck. Assume no energy or mass is lost from the system. Use c = 3,930 J/kg°C for
seawater.
Calculate the final temperature of the seawater-deck system.
Write your answer rounding to the nearest tenth.
The final temperature of the seawater-deck system is 990°C.
What is heat?The increment in temperature adds up the thermal energy into the object. This energy is Heat energy.
The deck of a small ship reaches a temperature Ti= 48.17°C seawater on the deck to cool it down. During the cooling, heat Q =3,710,000 J are transferred to the seawater from the deck. Specific heat of seawater= 3,930 J/kg°C.
Suppose for 1 kg of sea water, the heat transferred from the system is given by
3,710,000 = 1 x 3,930 x (T - 48.17)
T = 990°C to the nearest tenth.
The final temperature of the seawater-deck system is 990°C.
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A snail is traveling along a straight path. The snail’s velocity can be modeled by
The acceleration of the snail will be 7/13 m/sec². The acceleration is found as the rate of change of the velocity.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
The given data in the problem is;
v(t)=1.4ln(1’t²) inches per minute
0<t<15 minute
Acceleration is found as;
[tex]\rm v('t)=1.4 \times \frac{1}{1+t^2} (2t)[/tex]
Acceleration at t= 5 minute;
[tex]\rm v'(5)=\frac{1.4(2)(5)}{1+5^2} =\frac{14}{26} \\\\ v'=\frac{7}{13}[/tex]
Hence, the acceleration of the snail will be 7/13 inch per square minute.
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12. what is the wavelength of em radiation that ejects 2.00-ev electrons from calcium metal, given that the binding energy is 2.71 ev? what type of em radiation is this?
From the calculation, the wavelength of the waves is about 264 nm and belongs to the ultraviolet spectrum.
What is photoelectric effect?The term photoelectric effect can be used to describe the loss of electron from the surface of a metal. Given that; KE = E - W, where;
KE = kinetic energy of the emitted photoelectron
E = energy of the photon
W = work function of the metal
[tex]2= E - 2.71\\E = 2 + 2.71\\E = 4.71ev or 7.5 * 10^-19 J[/tex]
λ= hc/E
λ= [tex]6.6 * 10^-34 * 3 * 10^8/7.5 * 10^-19[/tex]
λ= [tex]2.64 * 10^-7 m[/tex] or 264 nm
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Five locations are marked on the world map. which location is most prone to hurricanes? five locations are marked on the world map. which location is most prone to hurricanes?
a.
b.
c.
d.
e.
Five locations are marked on the world map. The spot that is prone to hurricane mostly A.
What is hurricane?A hurricane is a cyclone with winds of 74 miles (119 kilometers) each hour or more prominent that is typically joined by downpour, thunder, and lightning, and that occasionally moves into calm scopes.
The locations on the world map spot A, B, C, D, E are regions with country prone to hurricane.
The SPOT A, is GULF of Mexico, a sea bowl nearer to the Atlantic sea, encompassed with the North American landmass, the Hawaiian island is likewise inside that locale.
The SPOT B, is the southern Pacific sea with nations like BRAZIL, PERU, ECUADOR, CHILE, in that equivalent locale. This is likewise visited by the tropical storm.
The SPOT C, is inside the locales of AFRICA, nations at the edge are likewise impacted by typhoon.
The SPOT D, is Asian landmass with Russia at the edge. They are likewise inclined to typhoon.
The SPOT E, is the North Pacific sea locale situated at the upper left hand side of the world guide, with nations like Canada, Alaska and co. Near the artic circle.
Thus, location A is the most prone to hurricanes.
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I believe the answer is A. a
I've done the test, 16/16
it is seen that in a balloon filled with air,if we press one side of the balloon the other side bulges out.why is it so???
When we apply pressure on the one side of balloon the other side bulges out due to the movement of gas to other side.
What happen when we press one side of the balloon?If we press one side of the balloon, the other side bulges out because the gas that present on one side moves to the other side where there is no pressure. The body of balloon is elastic so when we apply pressure the other side bulges out.
So we can conclude that when we apply pressure on the one side of balloon the other side bulges out due to the movement of gas to other side.
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when using a physical balance on what pan we place the object and why
Answer:
wood
Explanation:
Wooden pans are usually used Wood has less density than water so it will not sink in liquid substances derived from water.So during physical balance it won't affect the balance which we neednone hsbisneienbjsnsidns ueheijejeie idhdidnis idndidjd idjdi
Answer:
A parallel plate air capacitor has a capacitance of 10 to the power -9. What potential difference is required for a charge of 5×10 to the power -5 C? What is the total energy stored in it?
The potential difference across the capacitor is 5 × 10∧4 volts and the energy stored in it is 1. 25 Joules
What is the energy in a capacitor?
The energy stored in a capacitor is an electrostatic potential energy.
It is related to the charge(Q) and voltage (V) between the capacitor plates.
It is represented as 'U'.
How to determine the potential difference
Formula:
Potential difference, V is the ratio of the charge to the capacitance of a capacitor.
It is calculated using:
V = Q ÷ C
Where Q = charge 5 × 10∧-5C and C = capacitance 10∧-9
Substitute the values into the equation
Potential difference, V = 5 × 10∧-5 ÷ 10∧-9 = 5 × 10∧4 volts
How to determine the energy stored
Formula:
Energy, U = 1 ÷ 2 (QV)
Where Q= charge and V = potential difference across the capacitor
Energy, U = 1 ÷ 2 ( 5 × 10∧-5 × 5 × 10∧4)
= 0.5 × 25 × 10∧-1
= 0.5 × 2.5
= 1. 25 Joules
Therefore, the potential difference across the capacitor is 5 × 10∧4 volts and the energy stored in it is 1. 25 Joules
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3. why is the sum of the maximum voltages across each element in a series r l c circuit usually greater than the maximum applied voltage? doesn't that inequality violate kirchhoff's loop rule?
The sum of the maximum voltages across each element in a series RLC circuit is usually greater than the maximum applied voltage because voltages are added by vector addition.
What is the Kichoff's loop rule?Kirchhoff's loop rule states that the algebraic sum of potential differences, as well as the voltage supplied by the voltage sources and resistances, in any loop must be equal to zero.
In a series RLCcircuit, the voltages are not added by scalar addition but by vector addition.
Kirchhoff's loop rule is not violated since the voltages across different elements in the circuit are not at their maximum values.
Therefore, the sum of the maximum voltages across each element in a series RLC circuit is usually greater than the maximum applied voltage because voltages are added by vector addition.
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Three objects have velocities that vary with time
#21
initial velocity=u=5m/sTime=t=2sAcceleration=a=1.3m/s²According to first equation of kinematics
v=u+atv=5+1.3(2)v=5+2.6v=7.6m/s#22
#a
v1=2+3(3)=2+9=11m/sv2=-8-4(3)=-20m/sv3=1-5(3)=-14m/sThe order is
v2<V3<v1#b
for speed find absolute velocity
S1=|11|=11m/sS2=|-20|=20m/sS3=|-14|=14m/sSo order is
S1<S3<S2
Answer:
See below ~
Explanation:
Question 21 :
⇒ v = u + at
⇒ v = 5 + 1.3 (2)
⇒ v = 5 + 2.6
⇒ v = 7.6 m/s
=============================================================
Question 22 : At t = 3
Subpart (a)
⇒ Object 1 : v = 2 + 3(3) = 11 m/s
⇒ Object 2 : v = -8 - 4(3) = -20 m/s
⇒ Object 3 : v = 1 - 5(3) = -14 m/s
⇒ Hence, their velocities are in the order : Object 2 < Object 3 < Object 1
Subpart (b)
⇒ Object 1 : v = | 2 + 3(3) | = 11 m/s
⇒ Object 2 : v = | -8 - 4(3) | = 20 m/s
⇒ Object 3 : v = | 1 - 5(3) | = 14 m/s
⇒ Hence, their speeds are in the order : Object 1 < Object 3 < Object 2
You launch a model rocket that has a mass of 1 kg. At a height of 500 m, it is
traveling at 120 m/s. What is its kinetic energy at this point?
A- 7,200j
B- 29J
C-60J
D- 14,400J
Based on the calculations, the kinetic energy of the model rocket at this point is equal to: A. 7,200 Joules.
Given the following data:
Mass = 1 kg.
Height = 500 m.
Velocity = 120 m/s.
How to calculate kinetic energy?Mathematically, kinetic energy can be calculated by using this formula:
K.E = 1/2 × mv²
Where:
K.E is the kinetic energy.M is the mass.V is the velocity.Substituting the given parameters into the formula, we have;
K.E = 1/2 × 1 × (120)²
K.E = 1/2 × 1 × 14,400
K.E = 7,200 Joules.
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What is the direction of a current that experiences the magnetic force shown above
east
south
north
west
Answer:
Sorry if I kwon the
answer I telling u
the answer sorry
what is precision?what is precision?
Answer:
According to Oxford Dictionaries "Precision" means "the quality, condition, or fact of being exact and accurate."
Explanation:
Hope this helps! :)
In alpha decay, alpha particles are ejected from the nucleus. which equation represents alpha decay?
Out of the given equations,
241Am 23Np + 4He
18F → 180+ °C
14C → 14N+_e
152 Dy → 15. Dy+y
The first equation shows the alpha decay which is ₉₅Am²²⁴ → ₉₃Np²³⁷ + ₂He⁴
What is alpha radiation?Alpha particles are emitted in the form of radiations when radioactive decay occurs. The atom of heavy nucleus emit the alpha particles that consist of two proton and two neutrons, also called helium nuclei.
The properties of alpha radiations are:
Alpha radiations can travel in a short distance.They can not penetrate into the skin or clothes.They can be harmful for the human when inhaled.They can be stopped by a piece of paper.The Americium with atomic weight 224 undergo alpha decay and produce ₉₃Np²³⁷ . The alpha particle is helium nuclei.
₉₅Am²²⁴ → ₉₃Np²³⁷ + ₂He⁴
Thus, the first equation represents alpha radiation.
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