Apply second equation of kinematics
[tex]\\ \tt\longmapsto s=ut+\dfrac{1}{2}at^2[/tex]
[tex]\\ \tt\longmapsto s=\dfrac{1}{2}(40)(2)^2[/tex]
[tex]\\ \tt\longmapsto s=20(4)[/tex]
[tex]\\ \tt\longmapsto s=80m[/tex]
Answer:
According to the Given Statement
Acceleration a of model rocket is + 40m/s²
Time for the rocket accelerate t is 2 s
Its initial velocity u is 0m/s ( it is at rest )
We have to calculate the height attained by rocket .
Using Kinematic Equation
h = ut + ½ at²On substituting the value we obtain
➥ h = 0×2 + ½ × 40 × 2²
➥ h = 0 + 20 × 4
➥ h = 80m
So, the height attained by the rocket is 80 metres.
Students want to make a scale model of the Earth and Moon system that shows correctly-scaled sizes and distances. Here are some guidelines they have to follow.
It has to be shown in the classroom, and the classroom is 51 square meters in area.
It has to be easily moved around since orbital motion and rotations will be shown.
It cannot cause damage if it is dropped.
All the students in the class should be able to see it from their desks.
Four different students came up with different designs. The designs and characteristics are shown in the table below.
Which design best satisfies the criteria and constraints of this Earth-Moon model?
A.
design 1
B.
design 3
C.
design 2
D.
design 4
Answer:
Design #3 seems to best fit the requirements (2 sq m).
The others are too bulky.
What would the equipotential lines look like for an infinitely long line charge coming into and out of the paper
The equipotential lines round the infinitely long line of charge are concentric circles round the line of charge.
Equipotential lineAn equipotential line is a line in which the electric potential is constant
Since the electric field of an infinitely long line of charge is perpendicular to the line of charge. At a given distance from the infinitely long line of charge, the electric field is constant. The electric field is constant within a circle round the line of charge. This circle round the line of charge is an equipotential line.So, equipotential lines round the infinitely long line of charge are concentric circles round the line of charge.
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Explain how you could use a metal to tell the difference
betwen water and a dilute acid
Answer:
If you put the metal extract into the water there will be no reaction but if you put it into the acid it will liberate H2 (hydrogen gas) Hence it is the difference
Explanation:
this should sum it down
the moon revolves around the earth in a
nearly circular orbit kept tere by the gravitational force exerted by the earth what does the gravity do?
Answer:
Gravity does no work on the Moon
Explanation:
What is the total work wfric done on the block by the force of friction as the block moves a distance l up the incline?.
The total work work done on a block by the force of friction is the force of friction times the distance traveled times the cosine of the angle between the friction force and displacement
Work done is measured in joules (J). It is distance moved along the line of action of the force is measured in metres (m)
What is work done?Work is said to be done when a force acts upon an object to cause a displacement.
Calculating the work done on an object
work done = force × distance
Where;
Work done is measured in joules (J)
Force is measured in newtons (N)
Distance is measured in meters (m)
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All materials made of atoms and molecules are________. (fill in blank)
please help, i will give brainliest.
Answer:
matter
Explanation:
How far will an object go if it is moving at a speed of 55 km/hr, and moves for 6.3 hours?
Answer:
346.5 km
Explanation:
to find distance- multiply speed by time
so 55×6.3= 346.5 km
please mark brainliest
Compare the gravitational field and the electric field produced by a proton
O The electric field is stronger and is the opposite direction of the gravitational field
C The gravitational field is stronger and is in the same direction as the electric field
O The gravitational field is the same strength as the electric field
O The electric field is stronger and has the same direction as the gravitational field
By using what we know about microscopic interactions, we will see that the correct option is:
"The electric field is stronger and is the opposite direction of the gravitational field"
Comparing the gravitaitonal and electric fields.
The gravitational field depends on the mass of the proton, while the electric field depends on the charge of the proton. We know that gravity is negligible at such small scales, where the electric and nuclear interactions rule. So for such small particles, electric fields will always be stronger than gravitational fields.
Now, in which direction points each field?We know that the gravitational force is an attractive force, so the field will point inwards.
In the other hand, the electric force depends on the type of the charge. Two equal chares repel and two opposite charges attract.
In the case of the proton, we have a positive charge, so it will only atract negative charged particles. So the vectors of the field point outwards.
Then we can conclude that the field's directions are opposite.
Then the correct option is:
"The electric field is stronger and is the opposite direction of the gravitational field"
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If identical spacecraft were orbiting Mars and Earth at identical radii (distances), which spacecraft would be moving faster
Answer:
a = G M / R^2 gravitational acceleration
a = ω^2 R acceleration due to centripetal force
a2 / a1 = ω2^2 / ω1^2 the one with the greatest gravitational acceleration would require the greatest speed
a2 / a1 = M2 / M1 using the first equation - since M is greater for earth - then the spacecraft for earth would be moving faster - using the term radii as distance from center
Note that the acceleration of an object at the surface for Mars is less that on-half of that of earth - so at zero height above the surface the spacecraft on earth would still be moving faster
6. An aircraft decelerates at 0.5 m/s2. After 8 minutes its velocity has dropped to 160 m/s. Find its initial velocity
vf²=vi²+at
t = 8 min = 480 s
decelerates = a = - (negative sign)
input the value:
160²=vi²-0.5 x 480
25600 = vi²-240
25840 = vi²
vi = 160.75 m/s
The initial velocity of the aircraft is equal to 400 m/s when it decelerates at 0.5 m/s².
What is the equation of motion?The equations of motion have described the behavior of a physical system in which motion is a function of time. The equations of motion describe a set of mathematical functions in terms of dynamic variables and the relationship between the velocity, time, displacement, and acceleration of a moving object.
The mathematical expressions for three equations of motion can be written as:
[tex]v = u + at\\S = ut +\frac{1}{2} at^2\\v^2-u^2 = 2aS[/tex]
Given, the final velocity of the aircraft, v = 160 m/s
The time taken by the aircraft, t = 8 min = 480 sec
The de-acceleration of the aircraft, a = -0.5 m/s²
From the first equation of motion, we can find the initial velocity of the aircraft:
[tex]v = u +at[/tex]
160 = u - (0.5) × (480)
u = 160 + 240
u = 400 m/s
Therefore, the initial velocity of the aircraft is equal to 400 m/s.
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A 10cm long ,2cm wide wooden wedge is pushed into a soft wood block .calculate :a,velocity ratio of the wedge b,the load on the soft wood if the effort applied is 30N
The velocity ratio of the wedge is 0.1
The load on the soft wood is 300 N.
Velocity ratio
The velocity ratio of a machine is the ratio of the distance traveled by effort to distance traveled by load.
V.R = distance traveled by effort/distance traveled by load
Let 1 cm of the wood's width = towards rightthen another 1 cm = towards leftV.R = 1 cm/ 10 cm = 1/10 = 0.1
Load on the soft woodThe load on the soft wood is calculated as follows;
[tex]\frac{30}{L} = 0.1\\\\L = \frac{30}{0.1} = 300 \ N[/tex]
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Using two boxes, design two solar ovens. Before you build, describe your designs. Discuss elements such as materials, box shape, and color, and explain why you think the oven will work.
Answer:
Find two boxes just a bit smaller than the other. The long sides of the box should be less than twice as long as the short side of the boxes. The smaller box should fit inside the larger box with about 1 inch in each direction to spare. The boxes can be cut down so that they fit together properly. Leave the flaps on the boxes. Buy a small sheet of Plexiglas (tm) a little bit smaller than the width and length of the top of the box. You will also need four pieces of cardboard to use for reflectors.
Explanation:
Determine the quantity of charge on a plastic tube which has been rubbed with animal fur and gained 3.8 x 10^9 electrons
The quantity of charge carried by the plastic tube is -6.08 x 10^-10 C.
What are electrons?Electrons are negatively charged particles that are found in the atom. The magnitude of charge carried by an electron is about -1.6 × 10^-19 C. We must note that the negative sign indicates that the electron is negatively charged.
The quantity of charge carried by the tube is obtained from;
q =ne
q = 3.8 x 10^9 × ( -1.6 × 10^-19 C)
q = -6.08 x 10^-10 C
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Carl hits a baseball with a force of 8 n. The next batter, stacy, hits it with 12 n of force. Which ball will accelerate faster?.
Answer:
The ball hit with 12N
Explanation:
Just took the quiz and got it right
PLEASE HELP!!
A toy truck has a speed of 2 m/s and kinetic energy of 30 J. What is its mass?
A. 10 kg
B. 15 kg
C. 5 kg
D. 20 kg
Who was the highest deity in the Shang religion?
A.
Di
B.
Laozi
C.
Shihuangdi
D.
Confucius
Answer:
Shangdi or A: Di
Explanation:
Shangdi was considered to be the supreme deity during the Shang dynasty (1600–1046 century BCE), but during the Zhou dynasty (1046–256 BCE) he was gradually supplanted by heaven (tian).
" Sensation " occurs in the while perception occurs in the 1) brain; body 2) skin; nerves 3 ) brainstem spinal cord 4 ) body brain
Hence the complete statement will be, " Sensation " occurs in the body while perception occurs in the brain.
Option D
Sensation and its resolveGenerally, senses acquire facts from the surroundings using the sensory receptors which eventually feed into neural inputs.
These neural impulses are then dispatched to the brain there it is prepared and interpreted for in addition evaluation which is recognized as perception.
Therefore,we have the follow statements to be true
Sensation occurs in the body
Perception occurs in the brain
Option D
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Mr Hules is making cookies for his family. A recipe for 24 cookies calls for 4 cups of sugar for every 6 cups of flour. How many cups of flour will he use if he needs to make 60 cookies?
I need the step by step process to
Answer:
15 cups of flour to make 60 cookies
Explanation:
first, do 60 divided by 25.
then we MULTIPLY the recipe by 2.5
24x2.5=60 amount of cookies
4x2.5=10 cups of sugar
6x2.5=15 cups of flour
15 cups of flour to make 60 cookies
:DDD
Answer:
15 cups of flour
Explanation: 60 times 6 = 360
24x=360
360 divided by 24 is 15.
According to current scientific estimates, when did the big bang occur?.
Answer:
13.8 billion years ago
Explanation:
What energy of light's photon gives a maximum kinetic energy of 1.62 eV to the photoelectrons ejected from a gold surface?(given: The work function for gold is 4.58 eV)
Describe, step by step, how you would set up a simple investigation to show that: kinetic friction is less than static friction
Answer:
You can use a block and an inclined plane (just a tilted board)
Place the block on the plane and gradually increase the angle the plane makes with the horizontal.
Static friction will keep the block in place (no sliding) until the angle between the plane and the horizontal is large enough. The block will now slide but is still under the influence of kinetic friction. Thus static friction is greater than sliding friction.
I’m in 8th grade and don’t know how to find m/s^2. Or acceleration from Force and mass can someone help me.
Help and explain thanks
Answer:
the faster an object moves the more kinetic it has. the more mass an object has, the more kinetic energy it has.
Use the picture to identify the part of a wave.
What is D?
Wait what do you mean what is D? I have no idea what your talking about. Well um... D is the fourth letter or the alphabet.
I have anxiety btw so i don't want to be warned it makes me feel weird or scared.
What is the new velocity of a 1140 kg car that was traveling at 13.6 m/s and slams on the brakes losing 5000J of energy?
Answer:
13.3 m/s
Explanation:
KE = 1/2 m • v^2
KE = 1/2 • 1140 kg • (13.6m/s )^2
KE = 105427.2 J
KE after brakes are slammed = 105427.2 J - 5000 J
KE after brakes are slammed = 100427.2 J
100427.2 J = 1/2 • 1140 • v^2
v = (100427.2 J • 2 / 1140 kg)^1/2
v = 13.3 m/s after adjusting for significant figs
a a Imagine a basketball bouncing. As it is moving up, does it have a positive or a negative acceleration? Why?
Answer:
moving up positive acceleration
Explanation:
when moving up as you bounce the ball
the speed changes gradually increasing so according to the equation
acceleration =[speed change ] ÷ period when speed change is positive acceleration is also positive , and an greater value
example speed changes 5m/s within 2 seconds throwing the ball upward
(these are assuming values to explain)
acceleration is 5/2 = + 2.5 m/s^2
so this is an positive acceleration
if negative we call deceleration
When a basketball is bouncing and moving up, it has a negative acceleration.
Acceleration is the rate of change of velocity with respect to time. If the velocity of the basketball is increasing in the upward direction as it bounces, the acceleration is directed downward (negative). This might seem counterintuitive at first, but it is essential to understand that acceleration is a vector quantity, which means it has both magnitude and direction.
When the basketball moves upward during its bounce, its velocity is slowing down due to the opposing force of gravity. As it moves against gravity, the magnitude of its velocity decreases until it reaches the highest point (apex) of its bounce, where its velocity momentarily becomes zero. At the apex, the basketball changes direction and starts moving downward, and its velocity increases in the downward direction.
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what are some risks using social media? select the three correct answers
A. sharing to much personal information
B. sending and receiving inappropriate photo's
C. being vulnerable to predatory adults
D. connecting easily with friends
Answer:
A
B
C
are the correct options
Calculate the acceleration if you push with a 6 N horizontal force on a 8 kg block on a
horizontal friction free air table.
Identifying Independent and Dependent Variables in Experiments
Answer:
The easiest way to identify which variable in your experiment is the Independent Variable (IV) and which one is the Dependent Variable (DV) is by putting both the variables in the sentence below in a way that makes sense.
“The IV causes a change in the DV. It is not possible that DV could cause any change in IV.”
Explanation:
A pendulum is observed to complete 23 full cycles in 58 seconds. Determine the period and
the frequency of the pendulum.
1
Answer:
Frequency=0.39Hz
Explanation:
A pendulum completes 23 full cycles in 58 seconds
A pendulum completes 1 full cycle in 58/23=2.52 seconds
Time taken(t)=2.52 seconds
Now,
Frequency=1/time taken
Frequency=1/2.25
Frequency=0.39Hz
When a pendulum is observed to complete 23 full cycles in 58 seconds. then the period is 2.521739 and the frequency of the pendulum is 0.39655 S⁻¹
What is the frequency?It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.
The frequency of a pendulum is the reciprocal of the time period can be given by the following relation
f = 1/T
where f is the frequency
T is the time period of the pendulum
As given in the problem that a pendulum is observed to complete 23 full cycles in 58 seconds
Then the number of cycles per second is known as the frequency
f = 23/58
f = 0.39655 S⁻¹
As the time period is reciprocal to the frequency
T= 1/f
T = 1/0.39655
T =2.521739
Thus, if 58 seconds pass before a pendulum completes 23 full cycles. then the pendulum's frequency would be 0.39655 S⁻¹, and its period would be 2.521739.
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