Sunday

February 1, 2015

February 1, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A cage descends a mine shaft with an acceleration of 0.5 m/s2. After the cage has travelled 25 metres, a stone is dropped from the top of the shaft. Determine : 1. the time taken by the stone to hit the cage, and 2. distance travelled by the cage before impact.
*Wednesday, December 31, 2014 at 5:30am*

**physics**

What is the mass if an elephant that has 45,000 J when it is moving 5.0 m/s
*Tuesday, December 30, 2014 at 8:28pm*

**Physics**

Initially sliding with a speed of 2.5 m/s, a 2.0 kg block collides with a spring and compresses it 0.35 m before coming to rest. What is the force constant of the spring?
*Tuesday, December 30, 2014 at 1:41pm*

**physics**

How much thrust is required to launch a 5 kg bottle rocket with an upward acceleration of 6.4 m/s2? I've gotten 32 because F=MA but I don't understand how to account for gravity. Please help!
*Tuesday, December 30, 2014 at 1:30pm*

**physics**

a rock is dropped from a high brige.at the end of 3 seconds of free fall the speed of the rock is:[in centimeters per second,g=10 m/second square]
*Tuesday, December 30, 2014 at 11:01am*

**physics**

Given that an iron ball falls in glycerine contained in a jar where the viscous force F depends on terminal velocity V radius R of the ball and the coefficient of viscosity obtain and name the mathematical expression suitable for the relationship btw the parameter if the ...
*Tuesday, December 30, 2014 at 10:55am*

**physics**

Two carts are in contact on a horizontal frictionless surface. Cart 'A' has a mass of 3 kg, and cart 'B' a mass of 2 kg. (a) Find the force F on 'A' needed to give the two carts an acceleration of 0.8 m/sec2 . What is then the force exerted on 'B&#...
*Tuesday, December 30, 2014 at 12:30am*

**Physics**

Hi! Would one of you please check my work? Thanks! ( I used significant digits, by the way) A student throws a 5.00 kg steel shot directly upwards so that it leaves his hand when it is 2.00 m above the ground. If its velocity is 0.15 m/s when it leaves his hand, calculate: 1....
*Monday, December 29, 2014 at 9:13pm*

**Physics **

The work W0 accelerates a car from 0 to 20 km/h. How much work (in terms of W0) is required to accelerate the car from 20 km/h to 100 km/h?
*Monday, December 29, 2014 at 7:47pm*

**I guess this is physics related?**

What is the biggest source of error in measuring the acceleration of a ball down a ramp? knowing the length of the ramp accurately measuring the time knowing the height of the ramp knowing the mass of the ball****
*Monday, December 29, 2014 at 5:09pm*

**Physics~ ONE MOREE**

Which of the following must the investigator measure during an experiment? independent variable dependent variable <<<<< controlled variable
*Monday, December 29, 2014 at 4:58pm*

**So what about this one bob? Physics**

Which of the following is closer to a guess? hypothesis<<<<< law question theory
*Monday, December 29, 2014 at 4:53pm*

**Physics**

Which of the following statements is true? A hypothesis always leads to a theory which leads to a law. A hypothesis always leads to a law which leads to a theory. A hypothesis must lead to a theory only. A hypothesis can lead to either a theory or a law. <<<<<&...
*Monday, December 29, 2014 at 4:16pm*

**physics**

A 5kg block is placed on an inclined plane raised to an angle with it just started to slip down. if its coefficients of friction is 0.3 calculate. and the speed of the block up to the plane if it is being pull up by a force of 30N
*Monday, December 29, 2014 at 10:51am*

**physics**

the speed of an object at the end of 4 successive seconds is 20,25,30 and 35 meters per second,respectively.the acceleration of this object is?
*Sunday, December 28, 2014 at 10:07pm*

**physics**

a man having a mass of 60 kg exerts a horizontal force of 200 newton in pushing a 90 kg object a distance of 60 meters along horizontal floor. he does this at constant velocity in 3 seconds.the weight of this man is[in newton,taking g =10m/s square]
*Sunday, December 28, 2014 at 10:03pm*

**physics**

How to make a project based on physics laws
*Sunday, December 28, 2014 at 1:07am*

**Physics**

Hello! A falling piano reaches a velocity of 120 km/h. Find the kinetic energy if the mass of the piano is 357 kg. Ek= 1/2mv^2 Ek= 1/2(357)(33m/s)^2 Ek= 194386.5 J The problem is that my answer key has the answer 208kJ. What's my error? I have tried this problem many times...
*Saturday, December 27, 2014 at 8:54pm*

**Physics**

a 15000 kg airplane descends a vertical distance of 10.0 km over a horizontal distance of 80.0 km. What is the airplane's loss of potential energy. (I'm confused about the height) Ep=mgh m= 15000 kg g= 9.81 m/s^2 h=??
*Saturday, December 27, 2014 at 6:53pm*

**physics**

When relaxed, an elastic cord has length L, cross section area A, mass M, and Young modulus Y. An object of mass m is hung from the ceiling using the cord. The system reaches a steady state. What is the longitudinal mass distribution lambda(z) of the stretched cord as a ...
*Saturday, December 27, 2014 at 3:13pm*

**Physics**

A ball is thrown straight upward and returns to the thrower’s hand after 2.3 s in the air. A second ball is thrown at an angle of 60◦ with the horizontal. At what speed must the second ball be thrown so that it reaches the same maximum height as the first? The ...
*Saturday, December 27, 2014 at 1:55pm*

**PHYSICS**

An automobile accident investigator needs to determine the initial westerly velocity of jeep (m=1720 kg) that may have been speeding before colliding head-on with a Volkswagen (m=1510 kg) that was moving with a velocity of 75.7 km/h east. The speed limit on this road is 90 km/...
*Saturday, December 27, 2014 at 1:15pm*

**Physics**

Station Math Two station astronauts will each perform two 8-hour EVAs within 13 days to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. What is the total amount of oxygen needed by the two astronauts to accomplish this? Please put your ...
*Saturday, December 27, 2014 at 1:52am*

**physics**

a vertical object placed on a bench is observed to have three shadows of different sharpness,in different directions.explain tha observation
*Friday, December 26, 2014 at 3:41pm*

**physics**

A golfer takes two putts to sink his ball in the hole once he is on the green. The ﬁrst putt displaces the ball 8.70 m east, and the second putt displaces it 6.04 m south. What displacement would put the ball in the hole in one putt? Answer in units of m and.......... ...
*Thursday, December 25, 2014 at 8:10pm*

**physics**

Two bodies of mass 3kg and 4kg are suspended at the ends of massless string passing over a frictionless pulley .the acceleration system is
*Thursday, December 25, 2014 at 10:21am*

**Physics**

1. What is happening to that air between the instruments and your ears? 2. How can you produce the change in the frequency? 3. Describe how the notes are produced in a violin?
*Wednesday, December 24, 2014 at 5:53pm*

**Physics **

Two students (90.0 kg and 60.0 kg) on roller skates face-to-face push against each other. The 90.0 kg student moves at 5.0 m/s just after their hands lose contact. I figured out part A (final velocity of 60.0 kg student) to be 7.5 m/s backward. I need help with part B. (b) ...
*Wednesday, December 24, 2014 at 12:52pm*

**Physics**

Problem: As you walk to class with a constant speed of 1.60m/s , you are moving in a direction that is 20.8∘ north of east. Part A How much time does it take to change your displacement by 22.0m east? Part B How much time does it take to change your displacement by 31.0m...
*Tuesday, December 23, 2014 at 9:56am*

**PHYSICS**

Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/3 revolution per second. Assuming a minimum coefficient of friction of 0.70 between clothing and wall, what diameter ...
*Monday, December 22, 2014 at 9:56pm*

**physics**

Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/3 revolution per second. Assuming a minimum coefficient of friction of 0.70 between clothing and wall, what diameter ...
*Monday, December 22, 2014 at 9:16pm*

**Physics**

A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 187.0 N at an angle of 25.0◦ with the horizontal. The box has a mass of 36.0 kg, and the coeﬃcient of kinetic friction between the box and ﬂ...
*Monday, December 22, 2014 at 7:24pm*

**Physics**

A bullet is fired vertically upward with an initial velocity of 98m/s from the top of a building 100m high, find a) the maximum height reached above the ground b) the total time before reaching the ground. C) the velocity on landing.
*Monday, December 22, 2014 at 12:36am*

**Physics**

A table tennis ball is dropped unto the floor from a height of 4m and it rebounds to a height of 3m. If the time of contact with the floor is 0.01secs, what is the magnitude and direction of the acceleration during the contact
*Monday, December 22, 2014 at 12:28am*

**physics**

a force of 200 N is exerted at an angle 30 degrees with respect to the horizontal on an object whose mass is 30kg. the coefficient of friction between the object and the surface is the 0.2.(a)what is the frictional force?(B) what is the acceleration of the object?(c) if the ...
*Sunday, December 21, 2014 at 8:22pm*

**Physics**

A 0.0420-kg hollow racquetball with an initial speed of 18.3 m/s collides with a backboard. It rebounds with a speed of 7.4 m/s. Calculate the total impulse on the ball.
*Sunday, December 21, 2014 at 7:34pm*

**Physics**

Two objects, one of mass 3kg moving at 2m/s, the other of mass 5kg and speed of 2m/s move towards each other and collide in a head on collision. If the collision is perfectly inelastic, find the speed of the objects after the collision.
*Sunday, December 21, 2014 at 7:31pm*

**physics**

120 grams of an unknown metal at a temperature of 95 degrees celcuius is poured into 140 grams of aluminum calorimeter containing 220 grams of water. If the inital temperature of the water and calorimeter was 15 degree celcuius and the final temperature was 18 celcius, find ...
*Sunday, December 21, 2014 at 5:35pm*

**physics**

A speeder doing 50.0 mi/hr (about 22 m/s) in a 25 mi/hr zone approaches a parked police car. The instant the speeder passes the police car, the police begin their pursuit. If the speeder maintains a constant velocity, and the police car accelerates with a constant acceleration...
*Sunday, December 21, 2014 at 3:00pm*

**physics**

A ball is thrown vertically up from the edge of a 150 m building with a veloicty of 10m/s. (A) how high did the ball rise? (b) how much time did it take fort he ball to reach this height ? (C) what is the velocity oft he ball as it strikest he ground ? (D) how long does it ...
*Sunday, December 21, 2014 at 2:34pm*

**Physics- revolutions**

A 0.013 kg rubber stopper attached to a 0.93 m string is swung in a circle. If the tension in the string is 0.70 N, what is the period of the stopper's revolution?
*Sunday, December 21, 2014 at 2:24pm*

**Physics~**

The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?
*Sunday, December 21, 2014 at 1:58pm*

**Physics**

A baseball with mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? -2.8m/s^2
*Sunday, December 21, 2014 at 1:16pm*

**Physics**

A 10.0 kg barrel is lifted by pulling up on a rope. The barrel accelerates at 1.50 m/s2. Find the force of tension on the rope.
*Sunday, December 21, 2014 at 12:48pm*

**physics**

a horizontal force of 3 N is excerted on an object while a vertical force of 4 N is excerted at the same time. calculate the resultant force on the object? 3 square + 4 square = 25 so the resultant force will be 25 N
*Sunday, December 21, 2014 at 6:35am*

**physics**

two girls exeret a force of 30 N and 10 N on a bag in same direction. a dog tugs at bag and drag it in oppsite direction with the force of 5 N. calculate the new force exerted on bag and draw a vector diagram. F= 10+30 = 40 N dog applied force in opposite direction with 5 N ...
*Sunday, December 21, 2014 at 5:19am*

**Physics- Horizontal Velocity **

How do you calculate the horizontal velocity of an object in a projectile problem?
*Sunday, December 21, 2014 at 1:32am*

**physics**

A block slides on a rough 45 degree incline .the coefficient of friction the block and incline is µk. what is the ratio of acceleration when the block accelerates down the incline to the acceleration when the block is projected up the incline?
*Saturday, December 20, 2014 at 6:38pm*

**physics**

A person can jump to a height of 1.5m on surface of earth. Find the velocity with which he jumps.
*Saturday, December 20, 2014 at 6:20pm*

**physics**

explain the terms uniform acceleration and average speed.
*Saturday, December 20, 2014 at 6:12pm*

**physics**

A small sphere of mass m is connected to the end of a cord of length r and rotates in a vertical circle about a fixed point O. The tension force exerted by the cord on the sphere is denoted by T . What is the correct equation for the forces in the radial direction when the ...
*Saturday, December 20, 2014 at 3:59pm*

**Physics**

What is the purpose of the resonator stringed instrument
*Saturday, December 20, 2014 at 1:50pm*

**physics please help**

A hoodlum throws a rock straight down from the roof of a building 109m high. If it takes 2.40s to hit the ground below, with what initial speed was the rock thrown? Please show all work
*Saturday, December 20, 2014 at 12:04pm*

**Physics please help**

TIgers pitcher justin throws a basketball staright upward 29.0m/s. Calculate A) the height to which the ball will rise b) the time it takes to reach the highest point c) the speed with which it will return to the same height which it was thrown d) the speed of the ball 2.50s ...
*Saturday, December 20, 2014 at 11:24am*

**physics please help**

black bart and wyatt earp have a race. wyatt moseys 400m in 58.0s and bart moseys the same distance in 60.0s. by what Distance does wyatt beat bart in this race? Please show all work would greatly appreciate have a test coming up and i don't understand at all how to do it
*Friday, December 19, 2014 at 8:23pm*

**NEED HELP ASAP PHYSICS**

A car traveling 16.0m/s crashes into concrete embankment and stops in 0.08s. Calculate: the initial speed in mi/hr the average acceleration of the car during the collision in m/s^2 Please show all work than you
*Friday, December 19, 2014 at 8:09pm*

**PHYSICS NEED HELP ASAP**

A car traveling 16.0m/s crates into concrete embankment and steps in 0.08s. Calculate: the initial speed in mi/hr the average acceleration of the car during the collision in m/s^2 Please show all work than you
*Friday, December 19, 2014 at 8:08pm*

**physics**

How does a “pop bottle” rocket use the principles of motion
*Friday, December 19, 2014 at 8:04pm*

**Physics AIPMT**

A stone is dropped under gravity from rest from a height h and it travels a distance 9h/25 in the last second. What is the height H?
*Friday, December 19, 2014 at 10:28am*

**physics**

The movement of an object or a point mass at a constant speed around a circle that has a fixed radius is called uniform
*Thursday, December 18, 2014 at 9:32pm*

**Honors Physics**

A canoeist is trying to paddle upstream in a river that has a velocity of 6.1 m/s. If he can paddle his canoe at a velocity of 6.2 m/s, will he make any headway? What will his velocity relative to the shore be?
*Thursday, December 18, 2014 at 5:33pm*

**physics**

If you use a horizontal force of 30.0 N to slide a 12.0 kg wooden crate across a floor at a constant velocity, calculate the acceleration.
*Thursday, December 18, 2014 at 4:27pm*

**Physics**

starting from rest a 7.5 kg suitcase slides down a 30 degree frictionless incline a distance of 3.1 m upon reaching the bottom it slides an additional 5 m before coming to a stop. a) determine speed of suitcase at bottom of ramp b) determine coefficient of kinetic friction ...
*Thursday, December 18, 2014 at 8:31am*

**Physics**

65 kg pole vaulter running at 10.2 m/s vaults over the bar. if height of bar was set at 4.96 m how fast was he moving as he cleared the bar
*Thursday, December 18, 2014 at 8:18am*

**Physics**

800 n student is standing in middle of frozen pond stranded 6.4 m from shore only thing he has is physics book which has mass of 3 kg so he throws it at 10 m/s toward one shore how long does it take him to reach opposite shore
*Thursday, December 18, 2014 at 8:09am*

**biology,chemistry,physics**

the contact process prepares purest form of sulphuric acid 2so2+o2=2so3 calculate its kp if following concentrations are found at equilibrium so2=0.59,o2=0.05 and so3=0.259
*Thursday, December 18, 2014 at 6:28am*

**physics**

9th grade physics sketch a picture of the initial total velocity for the projectile when the angle is at 0 degrees, 30 degrees and 60 degrees. Resolve each into vertical and horizontal components. No velocity given
*Wednesday, December 17, 2014 at 10:09pm*

**Physics**

An attack helicopter is equipped with a 20 mm cannon that fires 116 g shells in the forward direction with a muzzle speed of 819 m/s. The fully loaded helicopter has a mass of 4870 kg. A burst of 96.2 shells is fired in a 4.51 s interval. What is the resulting average force on...
*Wednesday, December 17, 2014 at 9:34pm*

**physics**

An arrow is shot at an angle 39◦ with the horizontal. It has a velocity of 54 m/s. How high will the arrow go? The acceleration of gravity is 9.8 m/s^2. Answer in units of m
*Wednesday, December 17, 2014 at 8:34pm*

**Physics**

gtrgrt
*Wednesday, December 17, 2014 at 7:23pm*

**physics**

How much work is done on a lawn mower pulled 3.4 m by a force of 54 N at an angle of 10°?
*Wednesday, December 17, 2014 at 6:49pm*

**Physics**

A block of mass 8.1 kg is pulled to the right by an applied force of 76.2 N. If the acceleration is 0.84 m/s^2, how much friction must be present?
*Wednesday, December 17, 2014 at 6:07pm*

**physics **

a child is twirling a 0.0120 kg ball on a string in a horizontal circle whose radius is 0.100m. The ball travels once around the circle in 0.500s. Determine the centripetal force acting on the ball
*Wednesday, December 17, 2014 at 4:49pm*

**physics**

Fall time under g is sqrt 2h/g. Can someone give a derivation from the equations of motion please? Thanks.
*Wednesday, December 17, 2014 at 4:22pm*

**physics**

6 point masses of mass m each are at the vertices of a regular hexagon of side l.caculate the forces on any of the masses.
*Wednesday, December 17, 2014 at 12:43pm*

**physics**

In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball when it reaches the ...
*Wednesday, December 17, 2014 at 12:25pm*

**Physics **

What is the coefficient of friction on a 221.9 gram block of wood with 150 grit sandpaper on the bottom being pulled by .392 newtons. NEED HELP IMMEDIATELY!!!!!! Please and thank you
*Wednesday, December 17, 2014 at 12:21pm*

**Physics**

Find the component form of ⃗v given a magni- tude of 9 and an angle of θ = 90◦ with positive
*Wednesday, December 17, 2014 at 11:04am*

**Science-Physics**

A mover is pushing a crate across the floor. He exerts a force of 500 Newtons and pushes the crate a distance of 5 Meters. How much work did the mover do on the crate?
*Wednesday, December 17, 2014 at 9:50am*

**physics**

the second floor of a house is 6m above street level. How much work is required to lift a 300-kg refrigerator to the second-floor level?
*Wednesday, December 17, 2014 at 9:11am*

**Physics**

box of books weighs 350 n is shoved across the floor with a force of 500 n directed downward at angle of 37 with horizontal. if muk between box and floor is .5 how long does it take box to move 4 m starting from rest and what is largest value of muk that will allow the box to ...
*Wednesday, December 17, 2014 at 9:08am*

**physics**

A steel ball is thrown vertically upward and a ping pong ball is dropped vertically downward. the two balls roll at the same time. which will have a greater acceleration, why?
*Wednesday, December 17, 2014 at 8:55am*

**Physics**

a person standing at the edge of a seaside cliff kicks a stone horizontally over the edge with speed of 31 m/s cliff is 51 m above water. how far from base of cliff does stone land and what is speed of stone when it hits water
*Wednesday, December 17, 2014 at 8:51am*

**Physics**

You plan to fly a model airplane of mass 0.655 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.50 m. (Assume the weight of the plane is balanced by the upward "lift" force of the air on the wings of the plane.) The...
*Wednesday, December 17, 2014 at 6:29am*

**physics**

The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop.
*Wednesday, December 17, 2014 at 5:20am*

**Physics**

A 2.13 kg mass is suspended from a string which is pulled upward. The mass accelerates upwards with an acceleration of 3.10m/s2. What is the tension in the string?
*Tuesday, December 16, 2014 at 11:01pm*

**physics**

A balloon is rising at 3.6 m/s at same time is blown by wind for 5.4 m/s from east. Find the actual velocity and direction of hte balloon.
*Tuesday, December 16, 2014 at 8:59pm*

**physics**

The frequency and wavelength of a transverse wave on a string are 340 Hz and 0.70 m, respectively. The tension in the string is 110 N. What is the linear density of the string?
*Tuesday, December 16, 2014 at 8:42pm*

**Physics**

Using light of wavelength 600.0nm in a double slit apparatus we find delta x = 1.0cm. If we use the same apparatus for light of wavelength 450.0 nm, what is the new delta x on the screen? Delta x = L*lambda/d But L and d are not given, so how do I approach this problem?
*Tuesday, December 16, 2014 at 8:17pm*

**physics**

A soccer ball is kicked with an initial horizontal velocity of 16.5 m/s from a 92 meter high cliff. Determine the time it took the ball to reach the ground and how far the ball got from the edge of the cliff.
*Tuesday, December 16, 2014 at 8:16pm*

**Physics**

1.) A tennis ball (mass = 57 grams) is held directly above a basketball (mass = 624 grams)that is held 4.7 meters off the ground. Both are dropped simultaneously. Assuming an elastic collision, how high above the ground does the tennis ball reach after bouncing? (Note that the...
*Tuesday, December 16, 2014 at 8:13pm*

**Physics**

An airliner lands with a speed of 48.5 m/s. Each wheel of the plane has a radius of 1.25 m and a moment of inertia of 110 kg · m2. At touchdown, the wheels begin to spin under the action of friction. Each wheel supports a weight of 1.40 ✕ 104 N, and the wheels ...
*Tuesday, December 16, 2014 at 7:30pm*

**physics**

an object is dropped from a vertical cliff. How long does it take to reach 85 km/h?
*Tuesday, December 16, 2014 at 2:09pm*

**Physics I**

I'm not sure how to address any of these. I"ve attempted them but each time I do, I've gotten different answers. I'm not even sure where to begin. 1. The Duke’s efforts to conquer the Count are starting to really falter. He has been forced back away from ...
*Tuesday, December 16, 2014 at 12:48pm*

**Physics**

The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop. 1 m/s
*Tuesday, December 16, 2014 at 9:18am*

**Physics**

You plan to fly a model airplane of mass 0.655 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.50 m. (Assume the weight of the plane is balanced by the upward "lift" force of the air on the wings of the plane.) The...
*Tuesday, December 16, 2014 at 8:52am*

**physics**

A 200 gram copper calorimeter contains 400 grams of water at 25 C. A metal specimen weighing 250 grams is heated to a certain temperature and the plunged into the calorimeter The final temperature of the mixture is 42C. If then specific heat of the metal specimen is 0.09 cal/(...
*Tuesday, December 16, 2014 at 8:51am*

**Physics**

The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop. m/s
*Tuesday, December 16, 2014 at 8:34am*

**physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 12.2 m long. His speed at the bottom of the swing is 8.6 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Tuesday, December 16, 2014 at 8:12am*

**Physics**

A roller-coaster car speeds down a hill past point A where R1 = 8.2 m and then rolls up a hill past point B where R2 = 15.4 m, as shown below. (a) The car has a speed of 21.0 m/s at point A. if the track exerts a normal force on the car of 2.30 ✕ 104 N at this point, ...
*Tuesday, December 16, 2014 at 8:00am*

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