Two identical wind-up cars A and B are released. Car B has a 2 kilogram weight strapped to the back of the car. Which will have the greatest average speed towards the end of the motion?
A)Car A
B)They will both have an average speed of zero.
C)They will have the same average speed.
D)Car B
E)There is not enough information to answer.
Answer:
Car A would have a better average speed
Explanation:
added weight to a object that is self propelled will be slower than a identical object with no added weight
How long will it take an object to accelerate from a velocity of 4.8 m/s to a velocity of 15.6 m/s if it is accelerating at a rate of 0.9 m/s2
Initial velocity of the object (u) = 4.8 m/s
Final velocity of the object (v) = 15.6 m/s
Acceleration of the object (a) = 0.9 m/s²
By using equation of motion, we get:
[tex] \bf \longrightarrow v = u + at \\ \\ \rm \longrightarrow 15.6 = 4.8 + 0.9t \\ \\ \rm \longrightarrow 15.6 - 4.8 = 4.8 - 4.8 + 0.9t \\ \\ \rm \longrightarrow 10.8 = 0.9t \\ \\ \rm \longrightarrow 0.9t = 10.8 \\ \\ \rm \longrightarrow \dfrac{0.9}{0.9} t = \dfrac{10.8}{0.9} \\ \\ \rm \longrightarrow t = 12 \: s[/tex]
[tex] \therefore [/tex] Time taken by the object (t) = 12 s
A converging meniscus lens has an index of refraction of 1.55 and radii of curvature for its surfaces of 4.60 cm and 9.20 cm. The concave surface is placed upward and filled with carbon tetrachloride (CCl4), which has n = 1.46. What is the focal length of the CCl4-glass combination?
Answer: the focal length of the CCl4-glass combination is 102.31 cm
Explanation:
Given that;
Index of refraction n1 = 1.55
carbon tetrachloride (CCl4), which has n2 = 1.46
radii of curvature for its surfaces R1 = 4.6cm and R2 = 9.20 cm
the focal length of the CCl4-glass combination = ?
we can determine the focal length using the Formula;
1/f = ( n1 - n2) ( 1/R1 - 1/R)
so we substitute in our values
1/f = ( 1.55 - 1.46 ( 1/4.6 - 1/9.20)
1/f = 0.09 × 0.1086
1/f = 0.009774
f = 1 / 0.009774
f = 102.31 cm
Therefore the focal length of the CCl4-glass combination is 102.31 cm
The ability to do work or cause a change is the definition for
energy
motion
inertia
force
What is the SI unit for energy?
Newton meter
Joule
all of the above
What are the only two things you can do with energy?
use and waste
store and transfer
store and use
transfer and waste
Energy stored as motion is also known as
chemical potential
elastic potential
kinetic
gravitational potential
Kinetic energy depends upon
mass and velocity
mass and gravity
mass and displacement
mass and height
Energy stored in position is also known as
chemical
potential
kinetic
elastic
Potential energy depends upon
mass and velocity
mass and gravity
mass, height and gravity
mass and displacement
Energy stored in chemical bonds is known as
kinetic
chemical potential
gravitational potential
elastic potential
Energy stored in a rubber band is known as
kinetic
gravitational potential
chemical potential
elastic potential
What is the force of gravity for a 12 kg turkey?
Answer:
1. Energy
2. All of the above
3. Store and use
4. Kinetic
5. mass and velocity
6. Potential
7. mass, height, and gravity
8. Chemical Potential
9. Elastic Potential
10. (`⌒*)O-(`⌒´Q)
Explanation:
PLS HELP WILL GIVE BRAINLIST
what is the rate at which an object moves towards a target in
A speed B Arc C force D trajectory
Answer: The rate at which an object moves towards a target is Speed
Explanation:
Rate is something that tells us amount of solmething that changes in one unit of time.
Speed is defined as the measure of the rate of movement of a body expressed either as the distance travelled divided by the time taken.
Arc is defined as the apparent path described above and below the horizon taken up by a celestial body.
Force is defined as a push or pull upon an object resulting from the object's interaction with another object.
Trajectory is defined as the path followed by an object moving under the action of given force.
A car is traveling at 21.0 m/s. It slows to a stop at a constant rate over 5.00s. How far does the car travel during those 5.00 seconds before it stops?
Answer:
d = 105 m
Explanation:
Speed of a car, v = 21 m/s
We need to find the distance traveled by the dar during those 5 s before it stops. Let the distance is d. It can be calculated as :
d = v × t
d = 21 m/s × 5 s
d = 105 m
So, it will cover 105 m before it stops.
Is a light on potential or kinetic?
its the the first one u said
in half wave rectifier circuit the diode and load resistance are connected in ...to ac power source
What is the force of gravity for a 12 kg turkey?
Please help asap
Answer: 117.6N
Explanation:
By the second Newton's law, we know that:
F = m*a
F = force
m = mass
a = acceleration
We know that in the surface of the Earth, the gravitational acceleration is g = 9.8m/s^2.
Then we just can input that acceleration in the above equation, and also replace m by 12kg, and find that the force due the gravity is:
F = 12kg*9.8m/s^2 = 117.6N
How many significant figures are in 0.0067?
Answer:
2
Explanation:
there are 2 significant figures in there
Solar radiation makes several other energy sources possible, including ________
a. wind energy
b. tidal energy
c. geothermal energy
d. hydrothermal energy
e. nuclear energy
Answer:
a
Explanation:
wind energy results from solar radiation
Answer:
♡ madeline here ♡
goodmorning!
it's a, have a great day! ☆
- madeline/madi
✧･ﾟ: *✧･ﾟ:･ﾟ✧*:･ﾟ✧･ﾟ
Explanation:
A spinning ice skater will slow down if she extends her arms away from her body. Which of the following statements explain this phenomenon
A) circular motion is always uniform
B) A centripetal force always points outward
C) Angular momentum is always conserved
D) Centripetal acceleration cannot change
Marking brainliest
Answer:
B, which is why ice skaters often keep their arms close to their body when doing spins and jumps to minimize resistance.
A spring with spring constant 11.5 N/m hangs from the ceiling. A 490 g ball is attached to the spring and allowed to come to rest. It is then pulled down 6.70 cm and released.
What is the time constant if the ball's amplitude has decreased to 2.20 cm after 30.0 oscillations?
Answer:
The time constant is [tex]\tau = 17.5 \ s[/tex]
Explanation:
From the question we are told that
The spring constant is [tex]k = 11.5 \ N/m[/tex]
The mass of the ball is [tex]m_b = 490 \ g = 0.49 \ kg[/tex]
The amplitude of the oscillation t the beginning is [tex]x = 6.70 cm = 0.067 \ m[/tex]
The amplitude after time t is [tex]x_t = 2.20 cm = 0.022 \ m[/tex]
The number of oscillation is [tex]N = 30[/tex]
Generally the time taken to attain the second amplitude is mathematically represented as
[tex]t = N * T[/tex] Here T is the period of oscillation
[tex]t = N * 2\pi \sqrt{\frac{m}{k} }[/tex]
=> [tex]t = 30 * 2 * 3.142 * \sqrt{\frac{ 0.490}{11.5} }[/tex]
=> [tex]t = 38.88 \ s[/tex]
Generally the amplitude at time t is mathematically represented as
[tex]x(t) = x e^{-\frac{at}{2m} }[/tex]
Here a is the damping constant so
at [tex]t = 38.88 \ s[/tex] , [tex]x_t = 2.20 cm = 0.022 \ m[/tex]
So
[tex]0.022 = 0.067 e^{-\frac{a * 38.88}{2 * 0.490} }[/tex]
=> [tex]0.3284 = e^{-\frac{a * 38.88}{2 * 0.490} }[/tex]
taking natural log of both sides
=> [tex]ln(0.3284 ) = -\frac{a * 38.88}{2 * 0.490} }[/tex]
=> [tex]a = 0.028[/tex]
Generally the time constant is mathematically represented as
[tex]\tau = \frac{m}{a}[/tex]
=> [tex]\tau = \frac{0.490}{ 0.028}[/tex]
=> [tex]\tau = 17.5 \ s[/tex]
A skier leaves the end of a horizontal ski jump at 23.0 m/s and falls through a vertical distance of 3.45 m before landing.
(a) Neglecting air resistance, how long does it take the skier to reach the ground?
(b) How far horizontally does the skier travel in the air before landing?
m
Explanation:
Given
Velocity v = 23.0m/s
Distance S = 3.45m
Required
Time it will take the skier to reach the ground;
Using the equation of motion;
S = ut + 1/2gt²
3.45 = 23t + 1/2(9.8)t²
3.45 = 23t + 4.9t²
4.9t²+23t-3.45 = 0
Factorize;
t = -23 ±√23²-4(4.9)(-3.45)/2(4.9)
t = -23 ±√529+67.62/9.8
t = -23±√596.62/9.8
t = -23±24.43/9.8
t = 1.43/9.8
t = 0.146 secs
Hence take the skier 0.146 secs to reach the ground.
b) Horizontal distance covered is the range;
Range = U√2H/g
Range = 23√2(3.45)/9.8
Range = 23√6.9/9.8
Range = 23√0.7041
Range = 23(0.8391)
Range = 19.29m
Hence the horizontal distance travelled in air is 19.29m
(a).The time taken by the skier to reach the ground is 0.145 second.
(b).The skier travel in the air before landing is 19.29 meter.
a. Given that A skier leaves the end of a horizontal ski jump at 23.0 m/s and falls through a vertical distance of 3.45 m before landing.
Using equation of motion.
[tex]S=ut+\frac{1}{2}gt^{2}[/tex]
Where S is vertical distance , u is initial velocity and g is gravitational acceleration.
Substitute S = 3.45 m, u = 23m/s and g = 9.8 in above equation.
[tex]3.45=23t+\frac{1}{2} (9.8)t^{2}\\\\4.9x^{2} +23t-3.45=0\\\\t=0.145,-4.83[/tex]
Since, time can not be negative.
So that, [tex]t=0.145s[/tex]
b. The horizontal distance travel before landing is known as Range.
Horizontal distance ,
[tex]=v*\sqrt{\frac{2S}{g} }[/tex]
Substitute v = 23m/s , S = 3.45 and g = 9.8 meter per second square.
[tex]Distance=23*\sqrt{\frac{2*3.45}{9.8} } \\\\Distance=23*\sqrt{0.7041} \\\\Distance=23*0.8391=19.29m[/tex]
Thus, The skier travel in the air before landing is 19.29 meter.
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The mass of the Earth is about 6 x 1024 kg
and the mass of the moon is about 7 x 1022 kg.
The distance between the Earth and the Moon
is about 3.8 x 108
The magnitude of the gravitational force
between is closest to which of these?
m.
Well it seems that you did not give answer choices, but that its fine since we can use newtons law of universal gravitational, Fg = GM1M2/r^2. So G is the gravitational constant, which is 6.67*10^-11, we can plug in 6*1024 for M1, and 7*1022 for M2, and 3.8*108 for r. Which then we get 1.74 * 10^8 N as the force of attraction between the Earth and the moon.
The magnitude of the gravitational force between the earth and the moon is equal to 20 ×10¹⁹ N.
What is gravitational force?Gravitational force can be described as a force that attracts a body toward the center of the earth or any physical system that has mass. Every particle with mass exerts a gravitational pull on every other object with mass.
Mathematically gravitational force can be written as:
[tex]{\displaystyle F = G\frac{mM}{r^2}[/tex]
Where F is the force between objects, m and M are their masses, r is the distance between them, and G is the universal gravitational constant.
Given, the mass of the moon, M = 7 ×10²² Kg
The mass of earth, M = 6 ×10²⁴ Kg
The distance between the earth and the moon, r = 3.8 ×10⁸ m
The value of G = 6.7 ×10⁻¹¹ Nm²/Kg
The magnitude of the gravitational force can be calculated as:
[tex]{\displaystyle F = 6.7\times 10^{-11}\frac{6\times 10^{24}\times 7\times 10^{22}}{(3.8 \times 10^8)^2}[/tex]
F = 20 ×10¹⁹ N
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A baseball is thrown across the field. The ____________is measured from where the ball is thrown to where landed was 75 feet.
motion
direction
distance
reference point
Answer:
distance i think
Explanation:
1.045cm and a height of 30.48cm what is the volume of the cylinder
Answer:
104.57
Explanation:
V = πr^2h
-3.14, 1.045^2, and 30.48=104.567666431
A car moves forward up a hill at 12 m/s with a uniform backward acceleration of 1.6 m/s2. What is its displacement after 6 s?
Answer:
The displacement of the car after 6s is 43.2 m
Explanation:
Given;
velocity of the car, v = 12 m/s
acceleration of the car, a = -1.6 m/s² (backward acceleration)
time of motion, t = 6 s
The displacement of the car after 6s is given by the following kinematic equation;
d = ut + ¹/₂at²
d = (12 x 6) + ¹/₂(-1.6)(6)²
d = 72 - 28.8
d = 43.2 m
Therefore, the displacement of the car after 6s is 43.2 m
Suppose that the hatch on the side of a Mars lander is built and tested on Earth so that the internal pressure just balances the external pressure. The hatch is a disk 50.0 cm in diameter. When the lander goes to Mars, where the external pressure is 650 N/m2, what will be the net force (in newtons and pounds) on the hatch, assuming that the internal pressure is the same in both cases? Will it be an inward or outward force?
Answer:
The value is [tex]F_{net} = 4444 lb[/tex]
The force will be outward
Explanation:
From the question we are told that
The diameter of the disk is [tex]d = 50.0 \ cm = \frac{50}{100} = 0.5 \ m[/tex]
The external pressure on Mars is [tex]P = 650 \ N/m^2[/tex]
From the question we are told that
Internal pressure = External pressure
Generally the external Force on earth is
[tex]F_E = P_{atm} * A[/tex]
Here [tex]P_{atm}[/tex] is the atmospheric pressure with value [tex]P_{atm} = 1.013*10^{5}\ Pa[/tex]
So
[tex]F_E = 1.013 *10^{5} * \pi * \frac{d^2}{4}[/tex]
=> [tex]F_E = 1.013 *10^{5} *3.142 * \frac{0.50 ^2}{4}[/tex]
=> [tex]F_E = 19893 \ N[/tex]
Generally the external Force on Mars is
[tex]F= P * A[/tex]
[tex]F = 650 * \pi * \frac{d^2}{4}[/tex]
=> [tex]F = 650 *3.142 * \frac{0.5^2}{4}[/tex]
=> [tex]F = 127.6 \ N[/tex]
Net force is mathematically represented as
[tex]F_{net} = F_E -F[/tex]
=> [tex]F_{net} = 19893 -127.6[/tex]
=> [tex]F_{net} = 19765.6 \ N[/tex]converting to pounds
[tex]F_{net} = \frac{19765.6}{4.448}[/tex]
=> [tex]F_{net} = 4444 lb[/tex]
Given that that the value is positive then the force will be outward
What is the mass of a table that weighs 441 Newtons?
Answer:
45 kg is the mass of a table that weights 441 newton.
Answer:
45 kg
__________________________________________________________
Explanation:
We are given:
weight of the object = 441 N
Solving for the mass of the object:
We know that the weight of an object is the force applied by gravity to pull it towards the ground. So, we can say that:
Weight = Mg
[where M is the mass of the object and g is the gravitational constant]
replacing the variables with given values
441 = M(9.8) [since g = 9.8 m/s²]
Dividing both sides by 9.8
M = 441 / 9.8
M = 45 kg
Hence, the object has a mass of 45 kg
A model of Earth’s water budget shows that the precipitation on oceans is 420,000 km3 and the precipitation on land is 130,000 km3. If the evaporation from land is 90,000 km3, how much is the evaporation from oceans?
Answer:
Evaporation from oceans = 460,000 km³
Explanation:
Given:
Precipitation on oceans = 420,000 km³
Precipitation on land = 130,000 km³
Evaporation from land = 90,000 km³
Find:
Evaporation from oceans
Computation:
Evaporation from oceans = Precipitation on oceans + Precipitation on land - Evaporation from land
Evaporation from oceans = 420,000 km³ + 130,000 km³ - 90,000 km³
Evaporation from oceans = 460,000 km³
Answer:ccccccC
Explanation:okay
a bus with a mass of 5000kg is uniformly acceleration from rest. The net force acting on the bus is
Answer:
50,000N
Explanation:
According to Newton's second law of motion;
Net Force = Mass * acceleration
Given
Mass = 5000kg
Let the acceleration = 10m/s²
Net force = 5000 * 10
Net force = 50,000N
Hence the net force acting on the bus is 50000N
8. A rectangle is measured to be 6.4 +0.2 cm by 8.3 $0.2 cm.
a) Calculate its perimeter in cm
b) Calculate the uncertainty in its perimeter.
Answer:
a) The perimeter of the rectangle is 29.4 centimeters.
b) The uncertainty in its perimeter is 0.8 centimeters.
Explanation:
a) From Geometry we remember that the perimeter of the rectangle ([tex]p[/tex]), measured in centimeters, is represented by the following formula:
[tex]p = 2\cdot (w+l)[/tex] (1)
Where:
[tex]w[/tex] - Width, measured in centimeters.
[tex]l[/tex] - Length, measured in centimeters.
If we know that [tex]w = 6.4\,cm[/tex] and [tex]l = 8.3\,cm[/tex], then the perimeter of the rectangle is:
[tex]p = 2\cdot (6.4\,cm+8.3\,cm)[/tex]
[tex]p = 29.4\,cm[/tex]
The perimeter of the rectangle is 29.4 centimeters.
b) The uncertainty of the perimeter ([tex]\Delta p[/tex]), measured in centimeters, is estimated by differences. That is:
[tex]\Delta p = 2\cdot (\Delta w + \Delta l)[/tex] (2)
Where:
[tex]\Delta w[/tex] - Uncertainty in width, measured in centimeters.
[tex]\Delta l[/tex] - Uncertainty in length, measured in centimeters.
If we know that [tex]\Delta w = 0.2\,cm[/tex] and [tex]\Delta l = 0.2\,cm[/tex], then the uncertainty in perimeter is:
[tex]\Delta p = 2\cdot (0.2\,cm+0.2\,cm)[/tex]
[tex]\Delta p = 0.8\,cm[/tex]
The uncertainty in its perimeter is 0.8 centimeters.
A 4 kg cart has a momentum of 12 kg•m/s. What is the cart's velocity?
Answer:
Option A. 3 m/s
Explanation:
From the question given above, the following data were obtained:
Mass of cart = 4 Kg
Momentum of cart = 12 kg•m/s.
Velocity of cart =?
Momentum is simply defined as the product of mass and velocity. Mathematically, it is expressed as:
Momentum = mass × velocity
Thus, we can obtain the velocity of the cart by using the above equation as illustrated below:
Mass of cart = 4 Kg
Momentum of cart = 12 kg•m/s.
Velocity of cart =?
Momentum = mass × velocity
12 = 4 × velocity
Divide both side by 4
Velocity of cart = 12 / 4
Velocity of cart = 3 m/s
Therefore, the velocity of the cart is 3 m/s
A graph of the carbon dioxide levels in the Earth's atmosphere is shown below. Which of the following is true? A. The level of carbon dioxide in the atmosphere did not change before 1900. B. Carbon dioxide levels in the atmosphere have been dropping steadily since 1750. C. The steepest increase in carbon dioxide levels took place in the 18th century. D. The carbon dioxide levels in the atmosphere began increasing rapidly around 1950.
Answer:
D. The carbon dioxide levels in the atmosphere began increasing rapidly around 1950.
Explanation:
Study Island
The carbon dioxide levels in the atmosphere began increasing rapidly around 1950. Therefore, the correct option is option D.
What is carbon dioxide?One carbon atom is covalently doubly connected to the two oxygen atoms in each of the molecules that make up carbon dioxide. At room temperature, it exists as a gas.
In the atmosphere, carbon dioxide serves as a greenhouse gas because it absorbs infrared radiation despite being transparent to visible light. It has increased from which was before values of 280 ppm to be a gas in the atmosphere in the Stratosphere at 431 parts per thousand, or roughly 0.04% by volume. The carbon dioxide levels in the atmosphere began increasing rapidly around 1950. This statement is true.
Therefore, the correct option is option D.
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If you are sitting on a stationary bus, which frame of reference might make you think the bus has started moving?
a. A car in the next lane passes the bus.
b A passenger moves to the back of the bus. c The bus driver turns to look through the windshield.
scd None of the above.
Since we are sitting in the bus, our current system is the bus
If any object outside our current system moves, we might think that our system has started moving
We are given the choices:
Passenger moving to the back of the bus: This passenger is moving in our current system. So, his movement will not make us think that the bus is moving
The bus driver turns to look through the windshield: The driver is part of our system and is moving moving within the system. So, we wont think that the bus is moving
A car in the next lane: This car is outside our current system and if it moves, we might think that our current system (the bus) has started moving
Therefore, the movement of a car in the next lane will make us think that the bus is moving
A coconut is thrown straight downward and explodes into two pieces. One piece moves directly to the right. What direction does the other piece go?
A. left
B. right
C. down
D. up
E. it stays at rest
An airtight box, having a lid of area 80.0 cm^2, is partially evacuated. Atmospheric pressure is 1.01 Times 10^5 Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:_________.
Answer:
5×10^4Pa
Explanation:
Given force of 108 lb is required to pull the lid off the box,
To convert "Ib"to Newton ,we use conversation rate below
1 pounds = 4.4482216282509 newtons
Then 108 lb=x Newton
Cross multiply we have
X= 480.41Newton
The force that is needed to open the lid is F and pressure P.
We know that Pressure= Force/Area
Area is given as 80.0 cm^2, we can convert to m^2 for unit consistency since 1cm^2= 0.001m^2 then
80.0 cm^2 = 80×10^-4m^2
Substitute to the equation of the pressure we have
P= 480.41Newton/(80×10^4m^2)
P=6×10^4 Pa
The pressure in the box will be difference between the initial pressure and final pressure
=( 1.01 ×10^5 Pa)-(6×10^4 Pa)
= 50100Pa
= 5×10^4Pa
Therefore, The pressure in the box was
5×10^4Pa
Calculating the Velocity of a Wave Quick Check What is the speed of a wave that has a frequency of 173 Hz and a wavelength of 2.59 meters? Express your answer to the nearest whole number. m/s I need answers
Answer:
448m/s
Explanation:
The speed of the wave with a given wavelength and frequency can be calculated using the formula:
λ = v/f
Where;
λ = wavelength (m)
v = speed of wave (m/s)
f = frequency of wave (Hz)
In this question, λ = 2.59 metres, f = 173 Hz, v = ?
λ = v/f
v = λ × f
v = 2.59 × 173
v = 448.07m/s
To the nearest whole number, 448.07 can be written as 448
Hence, the speed of the wave (v) is 448m/s.
Answer:
What is the speed of a wave that has a frequency of 173 Hz and a wavelength of 2.59 meters? Express your answer to the nearest whole number.
448
m/s
Explanation:
How does Wind Energy impact the environment? Use in your own words.
Answer:
wind energy can have adverse environmental impacts by, including the potential to reduce, fragment, or degrade habitat for wildlife, fish, and plants.
Answer:
Wind energy is better than fossil fuels in that it dosen't require the extraction of a limited resource or the release of carbon dioxide, but the manufacturing of the turbines uses materials that are harmful to the enviroment and the nonrecyclable turbine blades will inevitably end up in landfils. In conclusion, wind energy has its problems, but it is still better than most of the nonrenewable alternatives.
Explanation: