Sunday

March 29, 2015

March 29, 2015

Number of results: 62,146

**Physics**

An object is thrown vertically upward. a) What are its velocity and acceleration when it reaches its highest altitude? b) What is its acceleration on its way downward half a meter above the ground? My ans: a) velocity is zero and acceleration is 9.8 m/s^2 b) i am not sure but ...
*October 17, 2009 by Nikita*

**Physics**

An object is thrown vertically upward. a) What are its velocity and acceleration when it reaches its highest altitude? b) What is its acceleration on its way downward half a meter above the ground? My ans: a) velocity is zero and acceleration is 9.8 m/s^2 b) i am not sure but ...
*October 18, 2009 by Nikita*

**Physics**

A Force 5N gives a mass M an acceleration of 8m/s-2 and m an acceleration of 24m/s-2. What is the acceleration if both the masses are tied together?
*July 29, 2012 by Anupam Khatiwara*

**PHYSICS**

if force acts on body WHOSE ACTION LINE does not Passes through its center of gravity then body will experience A ANGULAR ACCELERATION b linear acceleration C ZERO ACCELERATION D ZERO ACCELERATION
*June 13, 2014 by AYESHA*

**Physics - gravitational acceleration**

How does and Atwood machine make it easier to determine g - the acceleration due to gravity, rather than by just measuring the acceleration of a free-falling object?
*August 11, 2010 by Shaila*

**physics**

A special train is traveling down a long, straight track with a constant acceleration of 9m/s^2 in the forward direction. The train is located on Mars where the acceleration due to gravity is 9 m/s^2. If a passenger drops a ball and measures the acceleration of the ball, the ...
*April 6, 2014 by anonymous*

**Physics**

Compute the magnitude of the tangential acceleration, the radial acceleration, and the resultant acceleration of a point on its rim after it has turned through 38.2^\circ. Enter your answers separated with commas.
*February 7, 2012 by Anonymous*

**physics**

The drawing shows a top view of a square box lying on a frictionless floor. Three forces, which are drawn to scale, act on the box. Consider an angular acceleration with respect to an axis through the center of the box (perpendicular to the screen). Which one of the following ...
*April 26, 2014 by shamma*

**physics**

Two objects moving with constant acceleration starting from rest are to cover the same distance. If the second is to cover that distance in ¼ of the time would need a: a quarter of the first’s acceleration. b: a half of the first’s acceleration. c: sixteen times the first’s ...
*December 5, 2013 by bano*

**Physics**

Top fuel drag racer can reach the maximum speed of 304 mph at the end of the 1/4-mile (402 m) racetrack. (a) Assuming that the acceleration is constant during the race, calculate the average value of the acceleration of the top fuel car. (b) What is the ratio of that ...
*September 1, 2011 by Logan*

**Physics Changing Acceleration **

Derive position, velocity, and acceleration kinematics equations for an object undergoing a changing acceleration? I understand that somehow we need to get (∆a/∆t) as the change in acceleration into the kinematic equations but I really don't know where to start.
*September 28, 2013 by K*

**Physics**

1.During a tennis serve,the top of the raquet,which is 15m from its pivot point,accelerats from rest to a speed of 10m/s in a time of 0.10s.Calculate the average tangential acceleration and the top of the racquet and also its angular acceleration. Tangential acceleration = ...
*November 14, 2006 by miss sixty*

**Physics**

Which of the following could be units of acceleration? A) mi/h B) m/s C) mph D) m/s/s I know acceleration is the velocity/Time so I think they are all units of acceleration. Is this right?
*September 21, 2011 by Crystal*

**physics **

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 7.00 g at its outer end. What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end?
*November 27, 2010 by jessica*

**physics **

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 7.00 g at its outer end. What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end?
*November 27, 2010 by jessica*

**physics**

A car engine accelerates at a constant rate from 170 rpm to 3050 rpm in 7 seconds. I have found that at t=0, the angular velocity (omega)=17.8 rad/s, the angular acceleration (alpha)= 43.1 rad/s^2, the tangential acceleration = 7.76 m/s^2, and the centripetal acceleration is ...
*April 27, 2009 by Elle*

**PHYSICS**

A fan blade is rotating with a constant angular acceleration of +13.7 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity?
*October 28, 2010 by JOHN*

**physics**

A fan blade is rotating with a constant angular acceleration of +8.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity?
*July 16, 2013 by frank*

**Physics**

An airplane is flying in a horizontal circle at a speed of 106 m/s. The 81.0 kg pilot does not want the centripetal acceleration to exceed 6.16 times free-fall acceleration. Find the minimum radius of the plane’s path. The acceleration due to gravity is 9.81 m/s2. Answer in ...
*November 13, 2012 by Kyla*

**Physics**

An airplane is flying in a horizontal circle at a speed of 104 m/s. The 73.0 kg pilot does not want the centripetal acceleration to exceed 6.98 times free-fall acceleration. Find the minimum radius of the plane’s path. The acceleration due to gravity is 9.81 m/s2. Answer in ...
*March 5, 2013 by Anonymous*

**Physics**

Could you please check my answers and help me out with the last two? Thanxs! 1.Carefully define the following words: distance, displacement, speed, velocity, acceleration. Does it make a difference if we designate distance as "x" or "d"? (I dont understand this question) 2....
*September 2, 2007 by Jules*

**Physics(Please help)**

A fan blade is rotating with a constant angular acceleration of +12.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity? I do not know how to start this.
*June 5, 2012 by Hannah*

**Physics**

if an obejct has an horizontal acceleration of -0.51 m/s squared and vertical acceleration of -7.683 m/s squared, what is the resultant acceleration?
*October 15, 2009 by Jack*

**Physics**

To find the velocity and acceleration vectors for uniform circular motion and to recognize that this acceleration is the centripetal acceleration. Suppose that a particle's position is given by the following expression: r(t) = Rcos(omega*t)i + Rsin(omega*t)j Velocity equals...
*November 13, 2009 by Becky*

**Physics - acceleration..need to find velocity**

I am given two points on an acceleration vs time graph: (-2,13),(4,0). When t = -2s, v = 10 m\s. What velocity at t = 6s? I believe acceleration average is (-13/6), but how do I solve the rest get the correct answer, which is 44.7 m/s? Any help or hints would be greatly ...
*October 21, 2011 by Belinda*

**Physics**

An airplane is ﬂying in a horizontal circle at a speed of 104 m/s. The 88.0 kg pilot does not want the centripetal acceleration to exceed 6.15 times free-fall acceleration. Find the minimum radius of the plane’s path. The acceleration due to gravity is 9.81m/s2. Answer ...
*February 8, 2013 by Dave*

**physics**

Rocket-powered sleds are used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 444 m/s in 1.80 s and can be brought to a stop again in 2.15 s. (a) Calculate the acceleration of the sled when starting, and compare it to the ...
*September 21, 2010 by Anonymous*

**Physics 11th**

a body moves for a total of 9 seconds starting from rest with uniform acceleration and then with uniform retardation which is twice of value of acceleration to stop .what is the duration of uniform acceleration
*June 16, 2013 by anonymous*

**Physics**

Newton's second law states that if an object has zero acceleration, the net force acting on it is zero. My question is if you have an object at constant acceleration moving downward is there a net force being applied to it? Does constant acceleration= zero net force? Yes, for ...
*April 3, 2007 by Mary*

**Physics**

Could someone please check another one of my answer for me? Thank you! A commuter backs her car out of her garage with an acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her ...
*September 2, 2012 by Miaow*

**physics**

If you accelerate due to gravity (free fall), your acceleration is -9.8 m/s2. In some fields, particularly aviation, this is referred to as 1 g of acceleration. If you were accelerating at 2.5 g, what would be your average acceleration? If you started from rest, what would be ...
*October 12, 2013 by iyzi*

**AP Physics B**

can you check my reasoning 1. The problem statement, all variables and given/known data ok well then... we did a lab were you have a hanging mass attached to a stirng that went through a straw and was attached to a rubber stopper. The lab was to find the mass of the rubber ...
*September 13, 2009 by AP Physics B*

**physics**

(a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular speed of 79 rev/min in 5.0 s? m/s2 (b) When the disk is at its final speed, what is the tangential velocity of the bug? m/s (c) One second after the...
*March 27, 2010 by Kelsey*

**PHYSICS~Acceleration**

Two students get in an elevator on the ground floor and ride the elevator up to the fifth floor? Describe what happens to their velocity and acceleration during the trip. Would their velocity be increasing? There would be upward acceleration at first and then there would be ...
*November 22, 2010 by Anabelle*

**Physics **

Can an object with constant acceleration reverse it's direction of travel? I think it's yes because when a ball is thrown in the air it has a constant acceleration of gravity and the acceleration continues when it reverses it's direction. Am I right??
*February 9, 2014 by Kevin *

**physics**

An accelerometer is a device that uses the extension of a spring to measure acceleration in terms of Earth's gravitational acceleration (g). What is the approximate acceleration if this accelerometer spring is extended just 0.43 centimeters?
*February 25, 2014 by Anonymous*

**physics**

A car speeds up form 0m/s to 4m/s in 10 seconds. What is the acceleration? Look up the formula for acceleration, and then this is simple plug-n-chug. Use (v_final - v_initial)/time = average acceleration. Here v_final=4m/s, v_initial=0m/s and t=10.
*September 14, 2006 by Jennifer*

**physics**

Landing with a speed of 87.7 m/s, and traveling due south, a jet comes to rest in 939 m. Assuming the jet slows with constant acceleration, find the magnitude and direction of its acceleration. Magnitude of acceleration
*September 5, 2012 by martha*

**physics**

A car accelerates at a constant rate from zero to 25.9 m/s in 7.6 seconds and then slows to 15.4 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the entire time?What was the acceleration during the first acceleration period?
*May 22, 2013 by giggles24*

**Physics**

The tension on a string from which a 5.00kg object is suspended in an elevator is T=(44.0j)N. What is the acceleration of the elevator? Specify the acceleration in unit vector notation. T - Mg = M a with positive force upward. a = T/m - g = 8.8 - 9.8 = -1.0 m/s^2 Multiply that...
*February 20, 2007 by Sabrina*

**Physics**

In a physics experiment with an inclined air track, what do you predict about the following: a) Position graph b) Velocity c) Acceleration My ans: For a i predicted there would be a curve and i didn't know why b) velocity will decrease with time but why? c) acceleration is 0 m...
*October 27, 2009 by Nikita*

**physics**

A racing car reaches a speed of 40 m/s. At this instant, it begins a uniform negative acceleration, using a parachute and a braking system, and comes to rest 5.0 s later. (a) Determine the acceleration of the car. (b) How far does the car travel after acceleration starts?
*September 7, 2012 by Tamera*

**Physics**

A passenger on a train notices that a 2.00 kg mass is displaced 10.0° from the vertical as the train accelerates. (a) What is the acceleration of the train? (b) What would the acceleration be if the mass was 5.00 kg? c. What would angle have to be to indicate a horizontal ...
*June 3, 2014 by Anonymous*

**physics**

A passenger on a train notices that a 2.00 kg mass is displaced 10.0° from the vertical as the train accelerates. (a) What is the acceleration of the train? (b) What would the acceleration be if the mass was 5.00 kg? c. What would angle have to be to indicate a horizontal ...
*June 3, 2014 by Anonymous*

**Physics**

A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle increases to 2R. The ...
*June 8, 2014 by Sam*

**Physics**

A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle increases to 2R. The ...
*June 8, 2014 by Sam*

**physics**

98. On which of these hills does the ball roll down with increasing speed and decreasing acceleration along the path? (Use this example if you wish to explain to someone the difference between speed and acceleration.) 99. If you drop an object, its acceleration toward the ...
*June 11, 2014 by Becca*

**Physics/Math**

At time t1 = 2.00 s, the acceleration of a particle in counterclockwise circular motion is (9.00i + 8.00j) m/s^2. It moves at constant speed. At time t2 = 3.00s (3/4 of a revolution later), it's acceleration is (8.00i - 9.00j) m/s^2. Find the radius of the path taken by the ...
*February 18, 2007 by COFFEE*

**Physics (Circular Motion!!)**

Astronauts use a centrifuge to simulate the acceleration of a rocket launch. The centrifuge takes 30.0 s to speed up from rest to its top speed of 1 rotation every 1.10 s. the astronaut is strapped into a seat 7.40 m from the axis. A) What is the astronaut's tangential ...
*September 2, 2010 by George*

**Physics**

Astronauts use a centrifuge to simulate the acceleration of a rocket launch. The centrifuge takes 40.0s to speed up from rest to its top speed of 1 rotation every 1.40s . The astronaut is strapped into a seat 4.50m from the axis. What is the astronaut's tangential acceleration...
*February 7, 2011 by Fred*

**physics**

a jet plane flying at 550 m/s makes a curve. The radius of the circle in which the plane is flying is 9.0 X 10^3 m. What centripetal acceleration does the plane experience? Express this acceleration relative to g, the acceleration due to gravity.
*November 1, 2011 by Dee*

**PHYSICS I NEED MAJOR HELP PLEEEAAAAAASSSSSSSSSEEEE**

If velocity is positive and increasing then... displacement is.... acceleration is.... If displacement is positive and increasing then...... acceleration is...... velocity is..... If acceleration is positive and increasing then......... displacement is....... velocity is...
*December 13, 2006 by anonymous*

**Physics**

A 2.6 kg block slides down a 25° inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity is 0.80 m/s. The incline is 1.6 m long. (a) What is the acceleration of the block? m/s2 wb=m*g=2.6*9.8=25.48 fp=25.48sin25=10.77n Fn=...
*October 16, 2014 by Miah*

**physics**

A 3.00 kg book is dropped from a height of 2.2 m. The acceleration of gravity is 9.81 m/s2 . a) What is its acceleration? Answer in units of m/s2.
*October 11, 2010 by kayla*

**physics**

a comet experiences a uniforn acceleration from 60m/s to 183m/s what is the rate of acceleration?
*January 2, 2012 by ricky*

**Physics**

Which is greater, an acceleration from 30 km/h to 40 km/h or an acceleration from 85 km/h to 93 km/h if both occur during the same time?
*September 7, 2013 by Anonymous*

**Physics **

1) what does the y intercept on a force vs acceleration graph represent? 2)what is the relationship of mass and acceleration?
*October 30, 2013 by Aly*

**Physics**

Express the acceleration as a multiple of the gravitational acceleration, g (9.8 m/s^2) a=15 m/s divide by g, ie 15g's = 15*9.8m/s
*April 11, 2007 by Katie*

**physics**

a comet experiences uniform acceleration from 60 m/s to 183 m/s in 10.0 s. what is its rate of acceleration ?
*January 11, 2012 by Anonymous*

**physics**

A comet experiences uniform acceleration from 60 m/s to 183 m/s in 10.0. what is the rate of acceleration a. 6.0 m/s^2 b. 12.3 m/s^2 c. 18.3 m/s^2 d. 24.3 m/s^2
*February 28, 2012 by Anonymous*

**physics**

Rocket-powered sleds are used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 444 m/s in 1.80 s and can be brought to a stop again in 2.15 s. (b) Find the acceleration of the sled as it is braking and compare it to the ...
*November 26, 2010 by javane*

**Physics**

A g (pronounced "gee") is a unit of acceleration. Notice it is italicized. This is so it won't be confused with g (grams). 1 g = 9.8 m/s2. Typically a person will black out if they experience an acceleration of 4 to 6 g for more than a few seconds. Determine how fast an object...
*September 6, 2012 by Cindy*

**PHYSICS**

Can a car move around a racetrack so that it has tangential acceleration byt no centripetal acceleration?
*January 24, 2010 by hailey*

**physics**

A 3.03 kg briefcase is sitting at rest on a level ﬂoor. The acceleration of gravity is 9.81 m/s 2 . a) What is its acceleration?
*November 23, 2011 by Anonymous*

**physics**

An object traveling along the x-axis with constant acceleration has velocity v = +11.0 m/s when it is at x = 6.0 m and v = +20.0 m/s when it is at x = 10.0 m. What is its acceleration? HELP PLEASE!!!!!
*September 6, 2012 by nicole*

**Physics**

Use the equation for acceleration to determine the acceleration for the following motion. Time(s) 0 1 2 3 4 Velocity(m/s) 0 2 4 6 8
*October 18, 2013 by Adam*

**physics**

n object is dropped from rest. What is the acceleration after 6 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/
*October 20, 2013 by alyssa*

**physics**

If the rotation of a planet of radius 3.41 × 106 m and free-fall acceleration 8.71 m/s2 increased to the point that the cen- tripetal acceleration was equal to the gravita- tional acceleration at the equator, what would be the tangential speed of a person standing at the ...
*September 8, 2011 by squires*

**physics**

examples of: 1) acceleration against the direction of motion 2) acceleration in direction of motion 3)acceleration is uniform 4)acceleration is non-uniform
*June 23, 2012 by JOSHI *

**Physics**

1) would dropping an object higher than it's usual point change it's acceleration? 2) would throwing an object upward change it's acceleration? 3)does the mass of an object affect it's acceleration? 4) how does altitude affect the value of g? what other factors cause this ...
*September 26, 2011 by WOLLY*

**Physics**

a cars speedometer reads 20 m/s after acceleration from standing start, for 25s. what was the magnitude of acceleration?
*April 11, 2013 by Kydera Taft*

**physics**

A body travels with uniform acceleration.Its final velocity,v=180-7x,where x is the displacement.Then find its acceleration.
*September 30, 2014 by go ramesh*

**Physics**

Spark timer acceleration lab How do you determine the acceleration from the slope of your best fit line?
*October 17, 2014 by Kiki*

**physics**

What is a tire's angular acceleration if the tangential acceleration at a radius of 0.15 m is 9.4 x 10-2 m/s2?
*March 19, 2012 by Anonymous*

**physics **

which of the following situations are impossible : A) velocity negative, acceleration positive B) velocity positive , acceleration negative C) velocity increasing, acceleration negative D) velocity decreasing , acceleration zero E) velocity negative , acceleration negative
*September 2, 2013 by jessica*

**Physics**

A car is traveling around a horizontal circular track with radius r = 190.0 m at a constant speed v = 22.0 m/s as shown. The angle èA = 15.0° above the x axis, and the angle èB = 63.0° below the x axis. 1) What is the magnitude of the car’s acceleration? 2) What is the x ...
*January 19, 2013 by Anonymous*

**Physics 203 ( College)**

A disk of radius 12 cm, initially at rest, begins rotating about its axis with a constant angular acceleration of 7.8 rad/s2. What are the following values at t = 4.0 s? (a) the angular velocity of the disk (b) the tangential acceleration at and the centripetal acceleration ac...
*April 4, 2011 by Kayla*

**physics**

Is it possible for a car to move in a circular path in such a way that it has a tangential acceleration but no centripetal acceleration?
*October 9, 2009 by shawn*

**physics**

An electron, starting from rest and moving with a constant acceleration, travels 4.7 cm in 5.2 ms. What is the magnitude of this acceleration? Answer in units of km/s2
*September 13, 2011 by naia*

**Physics**

An electron, starting from rest and moving with a constant acceleration, travels 5.5 cm in 10 ms. What is the magnitude of this acceleration? Answer in units of km/s
*October 3, 2011 by Anonymous*

**Physics**

A motor cycle starts from rest and reaches a speed of 6m/s after travelling with uniform acceleration for 3s. What is his acceleration?
*October 14, 2012 by Jasmine*

**physics**

An electron, starting from rest and moving with a constant acceleration, travels 5.8 cm in 14 ms. What is the magnitude of this acceleration? Answer in units of km/s2
*September 28, 2014 by alex*

**Physics**

A particular Ferris wheel (a rigid wheel rotating in a vertical plane about a horizontal axis) at a local carnival has a radius of 20.0 m and it completes 1 revolution in 9.84 seconds. (a) What is the speed (m/s) of a point on the edge of the wheel? Using the coordinate system...
*August 6, 2011 by waqas*

**physics (Roller Coasters)**

a)maximum acceleration that the human body can be subjected to resasonably saftely b) what happens when the acceleration is larger than this
*November 10, 2007 by Jessica*

**Physics**

If you drop an object, its acceleration toward the ground is 10.0 m/s^2. If you throw it down instead, is its acceleration after throwing greater than 10.0 m/^2 ? Why or why not?
*April 9, 2012 by Anonymous*

**Physics**

If you drop an object, its acceleration toward the ground is 10.0 m/s^2. If you throw it down instead, is its acceleration after throwing greater than 10.0 m/^2 ? Why or why not?
*April 9, 2012 by Anonymous*

**physics**

A sprinter explodes out of the starting block with an acceleration of + 2.29 m/s2, which she sustains for 1.13 s. Then, her acceleration drops to zero for the rest of the race.
*September 11, 2012 by Kendall*

**PHYSICS**

5. What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.24? acceleration max=
*February 23, 2014 by sean*

**physics**

A car which is traveling at a velocity of 9.6 m/s undergoes an acceleration of 4.2 m/s2 over a distance of 450 m. How fast is it going after that acceleration?
*July 31, 2014 by Auqib Ihsan *

**Physics**

A firefighter with a mass of 52 kg slides down a vertical pole with an acceleration of 3 m/s/s . The acceleration of gravity is 10 m/s/s. What is the friction force that is acting on him
*October 30, 2014 by Davis*

**physics**

The block of mass 1.43443 kg has an acceleration of 3.6 m/s^2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s^2 and the surface is frictionles
*November 13, 2014 by Danny*

**physics**

An object with constant acceleration has velocity v = 12 m/s when it is at x = 6 m and v = 17 m/s when it is at x = 10 m. What is its acceleration?
*September 13, 2010 by katharine*

**physics**

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 320 km/h in a semicircular arc with a radius of 190 m. 1.) Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant tangential acceleration...
*September 20, 2010 by rick*

**Physics**

A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that us = 0.47 and uk = 0.21. What is the maximum acceleration the belt can have without the crate slipping? If acceleration of the belt exceeds the value determined in part A, what is the ...
*March 3, 2013 by Leanna*

**physics**

In a physics lab, students are asked to predict how the acceleration of the block sliding up a ramp compares to the acceleration down the ramp compares to the acceleration down the ramp. The block slides up a somewhat rough surface inclined at an angle of theta above the ...
*January 20, 2015 by Anonymous*

**Physics**

A ball is thrown as a projectile with a horizontal velocity of 30 m/s and a vertical velocity of 30 m/s. At the highest point which of the following is true? A) The velocity is zero B) The acceleration is 0 C) The acceleration is 9.8 m/s2 D) The acceleration is -9.8 m/s2 E) ...
*July 8, 2014 by Anonymous*

**physics**

calculate the period and frequency of a 3.500 m long pendulum at the following locations: a) the north pole, where acceleration due to gravity is 9.832 m/s^2 b) chicago, where acceleration due to gravity is 9.803 m/s^2 c) jakarta, indonesia, where acceleration due to gravity ...
*March 15, 2011 by giselle*

**physics**

How far from the center of the earth must a person be to experience acceleration due to gravity that is one half the acceleration at the surface?
*February 19, 2012 by Anonymous*

**physics**

A young boy swings a yo-yo horizontally above his head at an angular acceleration of 0.42 rad/s2. If the string is 0.55 m long, what is the tangential acceleration of the yo-yo?
*February 22, 2012 by Anonymous*

**Physics**

Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If the acceleration is done in a distance of 0.20 m, what is the magnitude of the electric field causing the acceleration?
*March 12, 2013 by Lauren*

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