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September 21, 2014

September 21, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

After undergoing through 90 degree compton scattering, the fraction of energy lost by photon is A) 10 % B) 50 % C) 20 % D) Zero E) None
*Sunday, June 1, 2014 at 6:28am*

**Physics**

A shell is fired from the ground with an initial speed of 1.54 ✕ 103 m/s at an initial angle of 52° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. (b) Find the amount of time the shell is in motion.
*Saturday, May 31, 2014 at 11:31pm*

**physics**

Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s.
*Saturday, May 31, 2014 at 9:27pm*

**physics**

A 3 kg object traveling 6m/s east has a perfectly elastic collilsion with a 4kg object traveling 8 m/s west After the sollision, the 3 kg object will travel 10 m/s west a. What was the total momentum before the collision? b. What is the total momentum of these objects after ...
*Saturday, May 31, 2014 at 6:26pm*

**Physics.**

A 500 g block lies on a horizontal tabletop. The coefficient of kinetic friction between the block and the surface is 0.25. The block is connected by a massless string to the second block with a mass of 300 g. The string passes over a light frictionless pulley as shown above. ...
*Saturday, May 31, 2014 at 4:34pm*

**Physics**

Please Help I have no idea how to approach this problem In a "Rotor-ride" at a carnival, people rotate in a vertical cylindrically walled "room." If the room radius was 5.7m , and the rotation frequency 0.35 revolutions per second when the floor drops out, ...
*Saturday, May 31, 2014 at 4:24pm*

**physics**

7. The speed of a man with and against the water currents in a river are 15km/h and 5km/h respectively. Find his speed in still water and the speed of the water currents.
*Saturday, May 31, 2014 at 6:13am*

**physics**

6. Two particles are moving with a constant speed v such that these are always at a constant distance d apart and their velocities are equal and opposite. After what time do these return to their original positions
*Saturday, May 31, 2014 at 5:52am*

**physics**

A stone is projected vertically to reach a maximum height 'h'. The ratio of kinetic energy to potential energy at a height 4h/5 is 1) 5:4 2) 4:5 3) 1:4 4) 4:1
*Saturday, May 31, 2014 at 2:04am*

**Physics**

A solid rubber ball has a diameter of 8.0 cm. It is released from rest with the top of the ball 80 cm above a horizontal surface. It falls vertically and then bounces back up so that the maximum height reached by the top of the ball is 45 cm, as shown. 80 60 40 20 If the ...
*Saturday, May 31, 2014 at 12:34am*

**Physics **

A 2.5-kg block is sliding along a rough horizontal surface and collides with a horizontal spring whose spring constant is 320 N/m. Unstretched, the spring is 20.0 cm long. The block causes the spring to compress to a length of 12.5 cm as the block temporarily comes to rest. ...
*Friday, May 30, 2014 at 10:23pm*

**Physics **

Two masses are connected by a string over an ideal pulley as shown. The coefficient of kinetic friction between m1 and the table surface is 𝜇. Find an expression for their common speed after the blocks have moved a distance L. You can assume that you know: m1, m2, L, ...
*Friday, May 30, 2014 at 10:23pm*

**Physics **

A box is pushed down an incline from point A to point B by a force F (and also under the influence of its weight). The distance from A to B, along the ramp, is 5.0 m. The force F is parallel to the incline, as shown, and has a magnitude of 2.0 N. The force of kinetic friction ...
*Friday, May 30, 2014 at 10:22pm*

**Physics **

A projectile is launched at an angle of 34.0o above the horizontal. The projectile has a mass of 1.50 kg and is given an initial speed of 20.0 m/s. a) What is the initial kinetic energy of the projectile? b) By how much does the gravitational potential energy of the projectile...
*Friday, May 30, 2014 at 10:22pm*

**Physics **

A pendulum consists of a swinging mass hanging from a massless string. The hanging mass is 2.0 kg and the string is 400.0 cm long. If the mass has a speed of 8.0 m/s when it passes the lowest point of its swing, a) what is the speed when the string makes an angle of 60.0o with...
*Friday, May 30, 2014 at 10:21pm*

**Physics **

A block of mass 12.0 kg is initially sitting at rest on a 30.0o incline. There is a spring mounted to the ramp with spring constant k = 13500 N/m. The block is released to slide down the incline and comes to a stop momentarily after the spring has been compressed a distance ...
*Friday, May 30, 2014 at 10:21pm*

**Physics**

A 2.50 kg fireworks shell is fired straight up from a mortar and reaches a height of 110. m. (a) Neglecting air resistance (a poor assumption, but we will make it for this example), calculate the shell’s velocity when it leaves the mortar. (b) The mortar itself is a tube ...
*Friday, May 30, 2014 at 7:02pm*

**Physics**

A 75.0 kg skydiver is free falling at 65.0 m/s when she pops her parachute. As the 'chute opens she slows to 5.50 m/s over a distance of 45.0 m. What force does the parachute exert of her harness during this time?
*Friday, May 30, 2014 at 7:01pm*

**physics**

The equation for distance is d = st. How far does a car go in 10 seconds at a speed of 44 m/s?
*Friday, May 30, 2014 at 1:57pm*

**physics**

A body is projected vertically upwards with a speed of 40 m/s.Find the distance travelled by body in last second of upward journey?(g=9.8m/s2 neglect effect of air resistance)
*Friday, May 30, 2014 at 2:37am*

**physics**

an object is dropped from the window of an apartment in a high rise building reaches the ground in 3 seconds. on which floor the apartment is located if height of each floor is 4m and window is 1 meter above the ground of that floor?
*Friday, May 30, 2014 at 1:17am*

**physics**

a wooden slab starting from rest slide down a 10m long inclined plane with acceleration of 5m per sec what would be the speed ay the bottom of the inclined plane
*Friday, May 30, 2014 at 1:03am*

**physics**

A 0.180 kg block on a vertical spring with spring constant of 4.00 ✕ 103 N/m is pushed downward, compressing the spring 0.061 m. When released, the block leaves the spring and travels upward vertically. How high does it rise above the point of release?
*Thursday, May 29, 2014 at 11:51pm*

**physics**

An 66.0 N box of clothes is pulled 5.5 m up a 30.0° ramp by a force of 116 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy.
*Thursday, May 29, 2014 at 11:49pm*

**physics**

A 56.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1310 N. If the diver comes to rest 4.1 m below the water's surface, what is the total distance between the diving board and the diver's ...
*Thursday, May 29, 2014 at 11:40pm*

**physics**

A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.2 s later. If the speed of sound is 340 m/s, how high is the cliff? vo= 0; s=340 m/s; t= 3.2s h=? t1+t2= 3.2 s t2= 3.2-t1 I used Eq: h= vo*t^1+1/2at^2 rearranged eq. h= (4.9)(t)^2 t^2= h/4.9 ...
*Thursday, May 29, 2014 at 11:31pm*

**Physics**

The pressure at a depth of 300 m in the ocean exceeds sea-level atmospheric pressure by 3.03 kPa. By how much does the volume of a 0.2-m3 aluminum object contract when lowered to this depth in the ocean? The bulk modulus of aluminum is 7 x 10^10 Pa.
*Thursday, May 29, 2014 at 9:39pm*

**physics**

A pair of sleds weighs 25kg and experiences a frictional force of 25N. If a dog team applies a 175N force pulling it 12m. 1. Find the work done by friction 2. Find the work done by the dog team 3. Find the net work done I need to compare my answers so the could you please post...
*Thursday, May 29, 2014 at 9:30pm*

**Physics**

a person pushes on a hockey puck with their stick at an angle so the vertical force is 22N down and the horizontal force is 45N forward. Assume the ice is frictionless. What is the actual force the hockey player transmits to the puck? what is the work done by the person ...
*Thursday, May 29, 2014 at 9:21pm*

**Physics**

A relative of yours belly flops from a height of 2.50 m (ouch!) and stops moving after descending 0.500 m underwater. Her mass is 62.5 kg. What was the magnitude of her acceleration in the pool? Assume that it is constant. How long was she in the water before she stopped ...
*Thursday, May 29, 2014 at 9:10pm*

**Physics! Help **

Calculate the net or resultant force in N in x direction given that F1=96.2 N is applied at angle of α=55.4° and a second F2=11.6 N is applied at angle of β=41.2°. See attached figure. Express your answer to 4 significant figures.
*Thursday, May 29, 2014 at 8:45pm*

**Physics**

Find the magnitude of the impulse delivered to a soccer ball when a player kicks it with a force of 1350N. Assume that the player’s foot is in contact with the ball for 6.20x10-3s.
*Thursday, May 29, 2014 at 8:33pm*

**Physics**

ohn and Jack are planning to do a physics lab related to vectors. Starting at the door of their physics classroom, they walk 2.0 meters, south. They make a right hand turn and walk 16.0 meters, west. They turn right again and walk 24.0 meters, north. They then turn left and ...
*Thursday, May 29, 2014 at 7:20pm*

**Physics**

A seagull can fly with a speed of 12.5 m/s (relative to the air). (a) How long will it take the gull to fly from his perch 420. m east to the carcass of a dead fish floating in the water if the wind is from the east at a speed of 2.70 m/s? (b) Having eaten lunch (nicely aged, ...
*Thursday, May 29, 2014 at 12:36pm*

**physics**

A swing is drawn to the side 3m from its equilibrium position and released. The swing is 2m on the other side of the equilibrium position 1.64s later. Find the angular frequency of the SHM.
*Thursday, May 29, 2014 at 12:27pm*

**physics**

A box has a mass of 0.220 kg. It is on a very smooth (frictionless) horizontal surface and is acted upon by a force of 2.36 N at an angle of θ = 44.8° with the horizontal. The magnitude of the acceleration of the box is m/s2?
*Thursday, May 29, 2014 at 11:54am*

**physics**

The power output of a star is 7.22 x 1028 watts. Every 47.0 seconds, the star converts _________ kg of its mass into energy.
*Wednesday, May 28, 2014 at 10:27pm*

**Physics **

The piolt of an airplane wishes to fly due north, but there is a 65-km/h wind blowing toward the east. in what direction should the pilot head her plane if its speed relative to the air is 340 km/h?
*Wednesday, May 28, 2014 at 8:16pm*

**Physics**

A batter hits a ball and it is caught 4 seconds later 100 meters from home plate. What is the initial velocity of the ball?
*Wednesday, May 28, 2014 at 8:08pm*

**physics **

how much force is required to stop a 100 mi/hr fastball? assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g
*Wednesday, May 28, 2014 at 8:01pm*

**physics**

Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 69.5 km/h, and B a speed of 84.3 km/h (both relative to the earth). (b) If A is initially 394 m in front of B, how long will it take for B to reach A?
*Wednesday, May 28, 2014 at 7:16pm*

**Physics**

Someone in a car going past you at the speed of 24 m/s drops a small rock from a height of 1.6 m. How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is 9.8 m/s2.
*Wednesday, May 28, 2014 at 6:46pm*

**physics**

At a certain undisclosed place (probably not on Earth) an Atwood's like experiment gives the graph of 1/t2 vs Δm the slope is 3.8 (in 1/(kg s2). One also knows that h=1.3m, total mass =0.8kg and I/r2 = 0.08kg. what is the gravitational acceleration is (in m/s2)?
*Wednesday, May 28, 2014 at 5:07pm*

**physics**

For the system on the diagram, the string is massless, and slides over the pulley without friction. The masses are m1 = 5.7kg and m2 = 6.4kg. what is the magnitude of the acceleration of the system is ( in m/s2)
*Wednesday, May 28, 2014 at 5:04pm*

**physics**

I weigh 130 pounds, so how much would I weight on a neutron star?
*Wednesday, May 28, 2014 at 3:16pm*

**physics**

Given the position function s(t) = t cos t, find the velocity function. Answer v(t) = -sin t v(t) = sin t v(t) = cos t - t sin t v(t) = cos t + t sin t
*Wednesday, May 28, 2014 at 2:27pm*

**Physics**

The average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time would be required for the car to accelerate from rest to 61.8 miles per hour?
*Wednesday, May 28, 2014 at 1:55pm*

**physics**

a flying bat emits squeaks of frequency 80 kHz.if a stationary observer hears the frequency of the squeaks as 78kHz,is the bat moving towards or away from the observer?determine the speed at which the bat is flying.
*Wednesday, May 28, 2014 at 12:53pm*

**Physics**

An 80 kg man is put into a tank of water. When completely submerged he displaces 75 L of water. If fatty body tissue has an average density of 0.9 kg/L and non-fatty body tissue has an average density of 1.1 kg/L, what percentage of the man is composed of fat?
*Wednesday, May 28, 2014 at 2:51am*

**Physics **

A 69.5kg football player is gliding across very smooth ice at 2.15m/s . He throws a 0.470kg football straight forward. A) What is the player's speed afterward if the ball is thrown at 16.0m/s relative to the ground? B) What is the player's speed afterward if the ball ...
*Tuesday, May 27, 2014 at 11:03pm*

**Physics**

A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude and ...
*Tuesday, May 27, 2014 at 9:59pm*

**physics**

The three objects in the drawing are connected by strings that pass over massless and friction-free pulleys. The objects move, and the coefficient of kinetic friction between the middle object and the surface of the table is 0.100. (Assume m1 = 12.2 kg and m2 = 26.0 kg.)
*Tuesday, May 27, 2014 at 9:13pm*

**Physics**

0.2295
*Tuesday, May 27, 2014 at 8:32pm*

**Physics**

A jet engine produces a sound level of 150 dB from a distance of 30 m (assuming spherical dissipation). The average human ear has an effective area of 12.0 cm2. What is the sound level at 60 m from a jet engine is? What would the power intercepted by an unprotected ear at 60 m...
*Tuesday, May 27, 2014 at 8:28pm*

**Physics**

The flux density through a 200 turn coil of area 8.5*10^-4 m squared changes from 0.03 T to 0.12 T in 15 mins. Calculate the induced emf in the coil.
*Tuesday, May 27, 2014 at 8:26pm*

**Physics**

A person’s arm is held with the upper arm vertical, the lower arm and hand horizontal. Find the center of mass of the arm in this configuration, given the following data. upper arm has a mass of 2.5kg and a COM 0.18m above the elbow, lower arm has a mass of 1.6kg and a ...
*Tuesday, May 27, 2014 at 7:55pm*

**Physics**

A 97kg astronaut and a 1100kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.13m/s directly away from the shuttle. Seven and a half seconds later the astronaut comes into contact with the shuttle. What was the...
*Tuesday, May 27, 2014 at 7:54pm*

**Physics**

A block with mass M = 5.00 kg rests on a frictionless table and is attached by a horizontal spring (k = 130 N/m) to a wall. A second block, of mass m = 1.25 kg rests on top of M. The blocks are displaced by 10 cm then released. If the coefficient of static friction between the...
*Tuesday, May 27, 2014 at 7:08pm*

**Physics**

A 69.5kg football player is gliding across very smooth ice at 2.15m/s . He throws a 0.470kg football straight forward. A) What is the player's speed afterward if the ball is thrown at 16.0m/s relative to the ground? B) What is the player's speed afterward if the ball ...
*Tuesday, May 27, 2014 at 6:40pm*

**physics**

A damp washcloth is hung over the edge of a table to dry. Thus, part (mass = mon) of the washcloth rests on the table and part (mass = moff) does not. The coefficient of static friction between the table and the washcloth is 0.350. Determine the maximum fraction [moff/(mon + ...
*Tuesday, May 27, 2014 at 6:03pm*

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
*Tuesday, May 27, 2014 at 5:58pm*

**Physics**

A 69.5kg football player is gliding across very smooth ice at 2.15m/s . He throws a 0.470kg football straight forward. What is the player's speed afterward if the ball is thrown at 16.0m/s relative to the ground? What is the player's speed afterward if the ball is ...
*Tuesday, May 27, 2014 at 5:37pm*

**Physics**

A 275-gram ball bounces off a wall. The ball stays in a horizontal plane throughout the motion. The ball strikes the wall with a speed of 4.50 m/s at an angle of 𝜃 = 35.0o relative to the wall and rebounds with the same speed at the same angle. If the ball is in ...
*Tuesday, May 27, 2014 at 5:21pm*

**physics**

Find the required angular speed, ω, of an ultracentrifuge for the radial acceleration of a point 2.00cm from the axis to equal 6.00×105 g (where g is the acceleration due to gravity).
*Tuesday, May 27, 2014 at 5:10pm*

**Physics, am i right?**

A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.0 V battery. What is the current passing through the 20.0 Ω resistor? (Points : 1) 0.45 A 0.90 A 1.35 A <--- 6.00 A
*Tuesday, May 27, 2014 at 4:44pm*

**Physics**

I'm confused with this one, here's what i got 45.0 v/ 40.0Ω = 1.125 A is the answer b? A 10.0 Ω resistor is in parallel with a 30.0 Ω resistor and supplied by a 45.0 V battery. What is the total current drawn from the battery? 0.003 A 1.10 A 6.00 A 338 A
*Tuesday, May 27, 2014 at 4:30pm*

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
*Tuesday, May 27, 2014 at 3:07pm*

**physics**

What is the maximum walking speed of an adult man whose legs are each 0.90 m long?
*Tuesday, May 27, 2014 at 2:51pm*

**Physics**

Help me with this please When a 20 V battery is hooked up to a 10 Ω resistor in a circuit, how much current flows through the circuit? 0.5 A 2 A 20 A 200 A
*Tuesday, May 27, 2014 at 2:32pm*

**physics-force and pressure**

find pressure when force is 300N and area is 700cm^2
*Tuesday, May 27, 2014 at 12:53pm*

**physics**

What force exists between a positive charge of 2.6 x 10-6 C and a negative charge of 4.2 x 10-5 C if they are separated by 8 cm?
*Tuesday, May 27, 2014 at 8:24am*

**Physics 2**

four equal-magnitude (4uc)charges are placed at the four corners of a square that is 20cm on each side.find the electric field intensity at the center of square , if the charge are all positive.
*Tuesday, May 27, 2014 at 7:50am*

**Physics**

an electron is sitting 10cm away from a small object -5nc it is let go and moves away from the charged object when it reaches a distance of 15 cm away find its speed
*Monday, May 26, 2014 at 6:27pm*

**Physics**

Please help me! 1)1. Two charged point bodies are placed into the opposite on diagonal vertices of a rectangular with sides of 6 and 8 cm in vacuum – Q1=3.2x10-11 C; Q2=-4.267x10-11 C. Calculate the electric field intensity at two other vertices of the rectangular and the...
*Monday, May 26, 2014 at 6:04pm*

**physics**

How much heat is added to 10.5 g of ice at -20.0°C to convert it to steam at 123.5°C?
*Monday, May 26, 2014 at 4:33pm*

**physics**

A force 457 Newtons causes a displacement 6.2 metres which is at an angle of 8 degrees to the direction of the force vector. Calculate the work done by the force.
*Monday, May 26, 2014 at 1:49pm*

**physics**

A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.
*Monday, May 26, 2014 at 1:48pm*

**physics**

What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero
*Monday, May 26, 2014 at 1:47pm*

**physics**

An electron of charge -e and a long straight wire carrying a current I to the right are both in the plane of the page, as shown above. In the position shown, the electron is a distance R from the wire and is moving directly toward it with speed v. What is the direction of the ...
*Monday, May 26, 2014 at 12:38pm*

**physics**

12 wires each of resistance 'r' ohm are connected to form a cube. Find the resistance if current enters through one edge and leaves through other corner of the same edge of the cube
*Monday, May 26, 2014 at 2:28am*

**physics**

You push your backpack, mass 2.8 kg across the desk with a force of 49.3 N. Calculate the acceleration of the backpack. Neglect friction forces and give your answer to 3 significant figures.
*Monday, May 26, 2014 at 1:12am*

**physics**

What is the frequency of the second hand of a clock, assuming it is keeping correct time? Select one: a. 1 Hz b. π/3 Hz c. 0.0167 Hz d. 60 Hz
*Monday, May 26, 2014 at 1:11am*

**physics**

A force 457 Newtons causes a displacement 6.2 metres which is at an angle of 8o to the direction of the force vector. Calculate the work done by the force.
*Monday, May 26, 2014 at 1:08am*

**college physics**

A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.
*Monday, May 26, 2014 at 1:06am*

**college physics**

What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero
*Monday, May 26, 2014 at 1:03am*

**Physics**

A golf ball is struck by a golf club at 55 m/s at an angle of 28.0o above the horizontal. The mass of the ball is 45 grams and is in contact with the golf club for 1.5 m/s. Calculate the average force exerted on the ball by the club.
*Monday, May 26, 2014 at 1:03am*

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
*Monday, May 26, 2014 at 1:02am*

**Physics**

A sled of mass 9.0 kg is sliding across a frozen lake with a speed of 5.0 m/s. A package of mass 4.0 kg is dropped onto it from above. Assuming there is no friction between the sled and the lake, what is the new speed of the sled?
*Monday, May 26, 2014 at 1:02am*

**physics**

An Angry Bird sits on a clothes line midway between the two poles. bird on line If the combined weight of the bird and rope is W, what is the tension in the rope in terms of θ and W? Select one: a. W cosθ / sinθ b. W tanθ c. W/(2sinθ) d. W/(2cosθ)
*Monday, May 26, 2014 at 12:54am*

**physics**

An aircraft has an initial mass of m0 and an initial acceleration of a0. After flying for 2 hours, the mass of the aircraft has decreased by 11%, due to the burning of the fuel. If the propulsive force provided by the engines is constant, what is the expression for the new ...
*Monday, May 26, 2014 at 12:52am*

**Physics**

A 50kg mass and a 85kg mass are hung over a frictionless pulley what is the acceleration of the system
*Monday, May 26, 2014 at 12:17am*

**college physics**

A car travels around a bend of radius R at a speed v1, experiencing a centripetal acceleration ac. The car then travels around a curve with the same radius R, but with a centripetal acceleration which has twice the magnitude of ac. What speed is the car moving, when going ...
*Sunday, May 25, 2014 at 6:43pm*

**physics**

You drop a ball, mass 127.5 grams from a height of 83.0 cm. It bounces back to a height of 50.5 from the floor. What is the change in gravitational potential energy from the moment it is dropped, to the moment it reaches the maximum height from the bounce?
*Sunday, May 25, 2014 at 6:37pm*

**physics**

You are in the supermarket, pushing a cart with a force of 79 Newtons in the horizontal direction. There is a constant force of kinetic friction operating on the cart of 14.2 Newtons. Calculate the net work done on the cart, if the cart is displaced 1.2 metres in a straight line.
*Sunday, May 25, 2014 at 6:36pm*

**physics**

You throw a ball with a mass of 182.2 g, with a speed of 4.6 m/s. Calculate the kinetic energy in Joules to 3 s.f. , and what is the uncertainty C=1 (Unsure: <67%) C=2 (Mid: >67%) C=3 (Quite sure: >80%)?
*Sunday, May 25, 2014 at 6:25pm*

**Physics**

(637) A cyclist is riding on a horizontal frozen meadow. He is turning so that he is tilted at an angle of 60°. Radius of curvature of the bend is 100m. What is the maximum speed of the cyclist? Thank you for your time!
*Sunday, May 25, 2014 at 11:43am*

**physics**

An athlete stretches a spring an extra 15.9 cm beyond its initial length. How much energy has he transferred to the spring
*Sunday, May 25, 2014 at 9:42am*

**Physics**

(595)Vinyl record spinning at 45rpm. What is the frequency of rotation (in Hz)? What is the orbital time of the vinyl record (in seconds)?
*Sunday, May 25, 2014 at 3:36am*

**Physics**

A car B travellin at constant velocity of 25m/s overtakes a stationary car B.Two seconds later,carB sets off in pursuit accelerating at a uniform 6m/s^2.How far does B travel before catching up with carA?
*Sunday, May 25, 2014 at 12:38am*

**PHYSICS**

two forces of magnitude 8N making an angle of 30 and 120 with xaxis . the y component of resultant A/ O B/ 4N C/ 8N D/ 16N
*Saturday, May 24, 2014 at 12:53pm*

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