Saturday

November 22, 2014

November 22, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

In the 1950’s, an experimental train that had a mass of 16200 kg was powered across a level track by a jet engine that produced a thrust of 5.02 × 105 N for a distance of 565 m. Find the work done on the train. Answer in units of J
*Monday, October 13, 2014 at 7:13pm*

**physics**

A 92.7 N grocery cart is pushed 13.7 m along an aisle by a shopper who exerts a constant horizontal force of 33.4 N. The acceleration of gravity is 9.81 m/s 2 . If all frictional forces are neglected and the cart starts from rest, what is the grocery cart’s final speed? ...
*Monday, October 13, 2014 at 7:01pm*

**Physics**

Spiderman is standing on the edge of a rooftop 100m above a swimming pool. He decides to jump in to cool off, so he springs out at a velocity of 30 m/s at an angle of 35 degrees above the horizontal. The near edge pool is located 127 m from the base of the building. It is a ...
*Monday, October 13, 2014 at 6:47pm*

**physics**

a cat chases a mouse across a 0.55 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 2.7 m from the edge of the table. The acceleration of gravity is 9.81 m/s. what was the cats speed when it slid off the table?
*Monday, October 13, 2014 at 6:43pm*

**physics**

A car travels 15.5 km due north and then 38.6 km in a direction φ = 74.3 ◦ west of north.Find the magnitude of the car’s resultant displacement. Answer in units of km
*Monday, October 13, 2014 at 5:56pm*

**Physics**

A square loop of wire of side 3.0 cm carries 3.0 A of current. A uniform magnetic field of magnitude 0.67 T makes an angle of 37degree with the plane of the loop. What is the magnitude of the torque on the loop? What is the net magnetic force on the loop?
*Monday, October 13, 2014 at 5:35pm*

**physics**

A frictionless massless pulley has 7 kg tied to a cable on the left side and an unknown mass (M) on the right. The unknown mass accelerates downward at 6.6 m/s2 What is the accelerationof the system/tension of the rope
*Monday, October 13, 2014 at 5:12pm*

**Physics**

a singly charged ion of uknown mass moves in a circle of radius 12.5 cm in a magnetic field of 1.7 t. the ion was accelerated through qa potential difference of 5.7 kv before it entered the magnetic field. what is the mass of the ion
*Monday, October 13, 2014 at 4:53pm*

**Physics **

A particle of mass =6.50 kg moves with a velocity v1=x1i+y1j+z1k. A second particle of mass =3.50 kg moves with a velocity v2=x2i+y2j+z2k. And a third particle of mass =6.30 kg moves with a velocity v3=x3i+y3j+z3k. Here, (x1,y1,z1)=(-2.5,5.4,1.2), (x2,y2,z2)=(-2.3,0.1,-2.5) ...
*Monday, October 13, 2014 at 4:21pm*

**Physics **

High-speed stroboscopic photographs show that the head of a golf club of mass 231g is traveling at 59.0m/s just before it strikes a 47.1g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 44.3m/s. Calculate the speed of the golf ...
*Monday, October 13, 2014 at 3:55pm*

**Physics**

Two acrobats, each of 50.0 kg, launch themselves together from a swing, holding hands. Their velocity at launch was 6.80 m/s and the angle of their initial velocity relative to the horizontal was 36.0 degrees upwards. At the top of their trajectory, their act calls for them to...
*Monday, October 13, 2014 at 3:54pm*

**Physics **

The space shuttle, with an initial mass M = 2.41×106 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s^2. The rate of fuel consumption is R = 6.90×103 kg/s. The shuttle reaches outer space with a velocity of vo = 4632. m/s...
*Monday, October 13, 2014 at 3:51pm*

**College Physics**

Two crates are connected by a massless rope that passes over a pulley. If the crates have mass 33 kg and 82 kg, find their acceleration. If the system begins at rest, with the more massive crate a distance 12 m above the floor, how long does it take for the more massive crate ...
*Monday, October 13, 2014 at 3:43pm*

**College Physics**

A hockey puck is sliding down an inclined plane with angle θ = 12.4° as shown in the figure below. If the puck is moving with a constant speed, what is the coefficient of kinetic friction between the puck and the plane?
*Monday, October 13, 2014 at 3:42pm*

**College Physics**

There are two forces acting on an object. One force has a magnitude of 35 N and is directed along the +x axis. The other force has a magnitude of 20 N and is directed along the +y axis. What is the direction of the acceleration of the object? Express your answer by giving the ...
*Monday, October 13, 2014 at 3:41pm*

**Physics**

A balloon, when rubbed against denim, gains a charge of -10ìC. The force between the balloon and the denim when they are separated by a distance of 5 cm is:
*Monday, October 13, 2014 at 3:24pm*

**physics**

With friction turned on, set the initial velocity of the box to 1.75 m/s, the coefficient of friction to 0.60, and the mass to 1.5 kg. Assume the acceleration due to gravity has a magnitude of 9.8 m/s2.
*Monday, October 13, 2014 at 3:21pm*

**physics **

A space probe is to be put into a circular orbit of radius 42.00 km about an asteroid. At this radius the magnitude of the gravitational acceleration, normally referred to as the "gravitational field", is 1.00×10-3 meters per second squared. What speed, in ...
*Monday, October 13, 2014 at 2:34pm*

**physics**

Suppose a roller-coaster car starts at a height of 39 m with a speed of 2.51 m/s. What will its speed be at height = 0m if the average force of friction is equal to 0.22 times its weight? The total distance traveled is 53m.
*Monday, October 13, 2014 at 2:11pm*

**College Physics**

A skier is traveling at a speed of 39.7 m/s when she reaches the base of a frictionless ski hill. This hill makes an angle of 14° with the horizontal. She then coasts up the hill as far as possible. What height (measured vertically above the base of the hill) does she reach?
*Monday, October 13, 2014 at 1:48pm*

**Physics - Spring Gun**

A toy gun uses a spring to shoot a ball with a mass of 5.0 g. The spring is “loaded” by compressing it 5.0 cm and has a spring constant of 288 N/m. The end of the spring is at the end of the gun (the ball does not travel any distance inside the gun after the spring) ...
*Monday, October 13, 2014 at 1:12pm*

**Physics**

While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction between the box and the floor is 0.27. The pushing force is directed downward at an angle θ below the horizontal. When θ is greater than a ...
*Monday, October 13, 2014 at 11:26am*

**Physics**

You are pulling your little sister on her sled across an icy (frictionless) surface. When you exert a constant horizontal force of 120 N, the sled has an acceleration of 1.7 m/s2 If the sled has a mass of 8.4 kg, what is the mass of your little sister?
*Monday, October 13, 2014 at 10:44am*

**Physics graphing**

Im making a graph of magnetic force vs current, after investigating the magnetic force exerted on a current-carrying wire, and how it varies with current, length, magnetic field and angle. How do I know when to use the point (0,0) on the graph?
*Monday, October 13, 2014 at 10:27am*

**physics**

the intensity level of a sound A is5dB greater than that of sound B and 3dB less than that of C. determine the ratio (Ic/Ib) of the intensity of sound C to that of sound B.
*Monday, October 13, 2014 at 9:28am*

**physics please help**

Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
*Monday, October 13, 2014 at 8:06am*

**physics **

for the uniform T shaped structure with mass 3M moment of inertia about an axis normal to the plane & passing through O would be
*Monday, October 13, 2014 at 7:44am*

**physics**

a ball is thrown straight up with a speed of 8.0 m/s from a third-floor window located 13.0 m above ground. Calculate the maximum height, measured from the ground, of the ball; calculate the ball's velocity when it reaches the ground, and calculate the total time it takes ...
*Monday, October 13, 2014 at 12:40am*

**physics**

Jordan throws a golfball straight up from the top of a building 50 meters high. The initial speed of the golfball is 20 m/s and it just misses the edge of the roof when it eventually falls. Neglecting air resistance, find the velocity of the golfball just at the instant it ...
*Sunday, October 12, 2014 at 11:21pm*

**physics**

A ball is rolling on a table and leaves the end side of the table with a velocity of 1.5 m/s. The table is 0.70 m high and the ball has a mass of 0.850 kg. What's the speed of the ball when it hits the ground? What equation should I use?
*Sunday, October 12, 2014 at 10:32pm*

**physics**

A bicycle tire rotates at 30 radians/s. If the bicyclist travels at 10m/s, what is the diameter of the tire?
*Sunday, October 12, 2014 at 8:26pm*

**Physics**

Two children are playing on two trampolines. The first child can jump one and a half times higher than the second child. The initial speed of the second child is 5 m/s. What is the maximum height of the second child? What is the initial speed of the first child? How long was ...
*Sunday, October 12, 2014 at 8:16pm*

**Physics**

A northbound 3000 kg truck collides with an eastbound 2000 kg car. The two vehicles slide together as a single mangled object after the collision, and the direction of the slide is exactly northeast (45 degree angle between north and east). Which vehicle was going faster ...
*Sunday, October 12, 2014 at 5:14pm*

**physics**

A particle of mass 7.7 × 10-8 kg and charge +11 μC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 4.2 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west. How much time...
*Sunday, October 12, 2014 at 5:13pm*

**Physics 12**

how to calculate the tie when the initial velocity of and object (rock) is given ( 12m/s 42 degrees above the horizontal. The object land at the other side of say a moat at a level of 9.5 m below the initial level. Air resistance is negligible. What is the time of flight? (the...
*Sunday, October 12, 2014 at 4:54pm*

**physics**

Stones are thrown horizontally with the same velocity from two buildings. One stone lands 1.81 as far away from its building as the other stone. Determine the ratio of the heights of the two buildings.
*Sunday, October 12, 2014 at 2:06pm*

**physics**

A box slides down a 28° ramp with an acceleration of 0.98 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
*Sunday, October 12, 2014 at 1:38pm*

**physics**

If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr
*Sunday, October 12, 2014 at 1:04pm*

**physics**

A projectile is fired with muzzle velocity v uphill over ground that slopes at an angle α to the horizontal. If the angle of projection is θ to the horizontal: i) show that the horizontal range is x = 2v2 (cos θ sin θ − cos2 θ tan α) /g ii) ...
*Sunday, October 12, 2014 at 11:17am*

**Physics**

If a car increases its speed from 5 meters per second to 25 meters per second over 40 seconds. what is the acceleration? Give the unit.
*Sunday, October 12, 2014 at 10:28am*

**Physics**

A student is swinging a 9 kg ball in a circular path in the vertical plane. Consider the instant when the string is horizontal as the ball is on its way up as shown in the figure. At this instant, the instantaneous tangential speed is 6 m/s, and the radius is 6 m. What is the ...
*Sunday, October 12, 2014 at 9:49am*

**Physics**

A cart of mass m (including the mass of the crane) has a pendulum hanging from a crane attached to the cart. There is no friction due to the normal force, u = 0, or wheel bearings of the cart wheels. The cart is experiencing and applied force to the left of 10N. The ball at ...
*Sunday, October 12, 2014 at 9:44am*

**physics**

a stone is dropped from the peak of a hill . IT covers the distance of 30m in last second of its motion. Find the height of the peak?
*Sunday, October 12, 2014 at 9:14am*

**physics**

. What is the resultant momentum of a system of two particles with these masses and velocities: 3.75 kg moving north at 5.6 m/s and 4.2 kg moving northwest at 2.3 m/s?
*Sunday, October 12, 2014 at 8:59am*

**Physics**

If a car increases its speed from 5 m/s to 25 m/s over 40 seconds. what is the acceleration? Give the unit.
*Sunday, October 12, 2014 at 7:51am*

**physics **

A ball is dropped from rest at the top of a 5.89-m-tall building, falls straight downward, collides inelastically with the ground, and bounces back. The ball loses 5.34% of its kinetic energy every time it collides with the ground. How many bounces can the ball make and still ...
*Sunday, October 12, 2014 at 3:33am*

**physics**

A 2.20-kg ball, moving to the right at a velocity of +1.27 m/s on a frictionless table, collides head-on with a stationary 7.20-kg ball. Find the final velocities of (a) the 2.20-kg ball and of (b) the 7.20-kg ball if the collision is elastic. (c) Find the magnitude and ...
*Sunday, October 12, 2014 at 1:53am*

**physics**

A driver take 0.20 second to apply the breaks (reaction time). If he is driving car at a speed of 54 kmh–1 and the breaks cause a deceleration of 6.0 ms–2. Find the distance travelled by car after he sees the need to put the breaks.
*Sunday, October 12, 2014 at 1:18am*

**physics**

An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go?
*Saturday, October 11, 2014 at 11:32pm*

**Physics**

Iam looking for the entire formula on how to solve this. If a person on a 35.0 m diameter Ferris wheel feels 30% heavier at the bottom of the wheel, how fast is it going around? Is N/Mg = 1 + v^2/Rg actual weight
*Saturday, October 11, 2014 at 9:24pm*

**physics**

suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.25 m/s2 and the contact force has a magnitude of 2.73 N. (a) Find the mass of box 1. (b) Find the mass of box 2. So do I subtract the contact force from ...
*Saturday, October 11, 2014 at 9:10pm*

**physics**

In a tennis serve, a 0.070 kg ball can be accelerated from rest to 41 m/s over a distance of 0.90 m. Find the magnitude fo the average force exerted by the racket on the ball during the serve. I know it is a force problem, but I am not even sure how to set this up.
*Saturday, October 11, 2014 at 9:06pm*

**physics**

Two crewmen pull a boat through a lock, as shown in Figure 5-25. One crewman pulls with a force of F1 = 155 N at an angle of θ = 32° relative to the forward direction of the raft. The second crewman, on the opposite side of the lock, pulls at an angle of 45°. With...
*Saturday, October 11, 2014 at 9:04pm*

**Physics**

A basketball player makes a jump shot. The 0.580-kg ball is released at a height of 1.90 m above the floor with a speed of 7.18 m/s. The ball goes through the net 3.05 m above the floor at a speed of 4.23 m/s. What is the work done on the ball by air resistance, a ...
*Saturday, October 11, 2014 at 8:21pm*

**Physics**

A puck of mass 0.165 kg, initially resting on ice, is hit by a stick to gain a speed of 32.0 m/s and then slides 25.0 m to lose 5.00% of its kinetic energy. (a) What is the work done on the puck by the stick? (b) What is the kinetic friction coefficient between the ice and puck?
*Saturday, October 11, 2014 at 7:45pm*

**Physics 30**

inquiry lab determining the refractive index of a variety of materials (Snell's Law Lab): Basically this lab: We us a polar coordinate paper and a semicircular shaped containers which we switch between, which are composed of different material. We shine a narrow light ...
*Saturday, October 11, 2014 at 6:30pm*

**physics**

The figure shows a girl and a boy each exerting a force to move a crate horizontally a distance of 13 m at a constant speed. The girl’s applied force is 75 N [22° below the horizontal]. The tension in the rope pulled by the boy is 75 N [32° above the horizontal].
*Saturday, October 11, 2014 at 4:29pm*

**physics**

A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 13.6 m/s at an angle of 43.1° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
*Saturday, October 11, 2014 at 2:43pm*

**physics**

A meteoroid is speeding through the atmosphere, traveling east at 15.5 km/s while descending at a rate of 10.6 km/s. What is its speed, in km/s?
*Saturday, October 11, 2014 at 1:56pm*

**Physics**

A pilot gets into trouble flying 2000m above the pacific ovean. He flies 550 km/h [S 30(degree)W] with a wind from the NW of 100 km/h. he ejects himself at a velocity of 10m/s [upwards]. What is his velocity at the instant he hits the ocean surface? Express your answer in km/h.
*Saturday, October 11, 2014 at 1:15pm*

**physics**

A 78 kg bag of mortar mix is sitting in the back of a truck rounding a traffic circle of radius 27 m at a speed of 21 km/h. Using the truck's frame of reference, find the force of contact between the bag and the side of the truck. Assume that the floor at the back of the ...
*Saturday, October 11, 2014 at 12:06pm*

**physics**

Assume that a particular crash test expert can withstand 18 times the acceleration due to gravity. Find the shortest distance over which her car can be brought to a stop from a speed of 78 km/h without the acceleration exceeding 18g.
*Saturday, October 11, 2014 at 12:03pm*

**physics**

Four forces are acting on an object. Force 1 has a magnitude of 5N at an angle of 70° above the +x-axis; force 2 has a magnitude of 8N at an angle of 35° above the +x-axis; force 3 has a magnitude of 4N at an angle of 20° above the -x-axis; force 4 has a magnitude ...
*Saturday, October 11, 2014 at 11:51am*

**physics**

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle and direction (ex...
*Saturday, October 11, 2014 at 11:31am*

**physics**

An airplane whose speed is 150km/hr climbs from a runway at an angle of 20° above the horizontal. What is its altitude two minutes after takeoff? How many kilometers does it travel in a horizontal direction during this two minute period? Find the altitude and horizontal ...
*Saturday, October 11, 2014 at 11:29am*

**Physics**

a car enters a 300m radius flat curve on a rainy day when the coefficient of static friction is between its tires and the road is .600. What is the maximum speed a car can travel around a curve without sliding.
*Saturday, October 11, 2014 at 10:29am*

**Physics**

A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 0.700 revolutions per second. What is the centripetal acceleration of the ball?
*Saturday, October 11, 2014 at 10:01am*

**Physics**

- a 1200 W motor bike can move at a maximum speed of 30.0 m/s . how much force does the motor exert? - what would be the average momentum of 60.0 kg sprinter who finishes 100.0 m in 60 s?
*Saturday, October 11, 2014 at 5:32am*

**physics**

a force of 3.00 N acts through a distance of 12 m in the direction of the force. find the work done
*Saturday, October 11, 2014 at 4:43am*

**Physics**

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle and direction (ex...
*Friday, October 10, 2014 at 10:51pm*

**Physics**

The potential difference between the plates of a capacitor is 335 V. Midway between the plates, a proton and an electron are released. The electron is released from rest. The proton is projected perpendicularly toward the negative plate with an initial speed. The proton ...
*Friday, October 10, 2014 at 10:40pm*

**Physics**

A 60.0 kg person rides in elevator while standing on a scale. The elevator has an acceleration 2.00 m/s^2 upward. What is the reading on the scale?
*Friday, October 10, 2014 at 10:04pm*

**physics**

While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.93 m/s. The stone subsequently falls to the ground, which is 17.1 m below the point where the stone leaves your hand. At what speed does the stone impact the ground? How ...
*Friday, October 10, 2014 at 10:00pm*

**physics**

Calculate the power output of a 1.7g spider as it walks up a windowpane at 2.5cm/s . The spider walks on a path that is at 25 ∘ to the vertical.
*Friday, October 10, 2014 at 9:46pm*

**College Physics**

A 0.300-kg ice puck, moving east with a speed of 5.86m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.300-kg puck after the collision? What ise the speed of the 0.990-kg puck after ...
*Friday, October 10, 2014 at 8:01pm*

**Physics**

Block B in the figure(Figure 1) rests on a surface for which the static and kinetic coefficients of friction are 0.65 and 0.40, respectively. The ropes are massless.What is the maximum mass of block A for which the system is in equilibrium? (Consider the state of the system ...
*Friday, October 10, 2014 at 8:01pm*

**physics**

A 0.300-kg ice puck, moving east with a speed of 5.86m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.300-kg puck after the collision? What ise the speed of the 0.990-kg puck after ...
*Friday, October 10, 2014 at 7:47pm*

**physics**

A 580 kg cannon and a supply of 41 cannon balls, each with a mass of 38.9 kg, are inside a sealed railroad car with a mass of 31000 kg and a length of 53 m. The cannon fires to the right; the car recoils to the left. The cannon balls remain in the car after hitting the wall. ...
*Friday, October 10, 2014 at 6:59pm*

**Physics**

Find the magnitude and direction of the resultant R of the three vectors shown in figure 1.3. The vectors have the following magnitudes: A=5.0, B=7.9, and C=8.0. Express the direction of the vector sum by specifying the angle it makes with the positive x-axis, with the ...
*Friday, October 10, 2014 at 6:38pm*

**physics**

A ball is thrown horizontally from the roof of a building 47.9 m tall and lands 35.4 m from the base. What was the ball's initial speed in m/s? Hint: Find the horizontal velocity by calculating the time of flight and using the horizontal distance.
*Friday, October 10, 2014 at 6:37pm*

**Physics Homework Help**

1.) Auston’s racecar has a speed of 80 m/s when Auston releases a drag parachute. If the parachute causes a deceleration of -4 m/s2, how far will the car travel before it stops? 2.) Jordan throws a golfball straight up from the top of a building 50 meters high. The ...
*Friday, October 10, 2014 at 6:34pm*

**Science Physics**

How long would it take a 4.50-kW motor to raise a 175-kg boiler to a platform 15.0 m above the floor? Is this correct? 175*9.80*15.0/4.50
*Friday, October 10, 2014 at 6:09pm*

**Physics**

An airplane whose speed is 150km/hr climbs from a runway at an angle of 20° above the horizontal. What is its altitude two minutes after takeoff? How many kilometers does it travel in a horizontal direction during this two minute period? My work: 150cos(20) = 140.9 150sin(...
*Friday, October 10, 2014 at 5:57pm*

**Math Physics**

A wattmeter shows that a motor is drawing 2200w. What horsepower is being delivered? Is this correct? 2200/746 = 2.95
*Friday, October 10, 2014 at 5:50pm*

**Physics**

A wattmeter shows that a motor is drawing 2200w. What horsepower is being delivered? Is this correct? 2200/746 = 2.95
*Friday, October 10, 2014 at 5:45pm*

**Physics**

Four forces are acting on an object. Force 1 has a magnitude of 5N at an angle of 70° above the +x-axis; force 2 has a magnitude of 8N at an angle of 35° above the +x-axis; force 3 has a magnitude of 4N at an angle of 20° above the -x-axis; force 4 has a magnitude ...
*Friday, October 10, 2014 at 5:42pm*

**Physics**

A 0.300-kg ice puck, moving east with a speed of 5.86m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.300-kg puck after the collision? What ise the speed of the 0.990-kg puck after ...
*Friday, October 10, 2014 at 4:49pm*

**physics**

A cyclist maintains a constant velocity of 4.1 m/s headed away from point A. At some initial time, the cyclist is 244 m from point A. What will be his displacement from his starting position after 60 s?
*Friday, October 10, 2014 at 3:43pm*

**physics**

A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 740-kg helicopter rises from rest to a speed of 7.6 m/s in a time of 3.1 s. During this time it climbs to a height of 8.6 m. What is...
*Friday, October 10, 2014 at 3:25pm*

**physics**

A basketball player makes a jump shot. The 0.610-kg ball is released at a height of 1.90 m above the floor with a speed of 7.08 m/s. The ball goes through the net 3.04 m above the floor at a speed of 4.29 m/s. What is the work done on the ball by air resistance, a ...
*Friday, October 10, 2014 at 3:24pm*

**physics**

A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.80 m. With the string hanging vertically, the object is given an initial velocity of 2.6 m/s parallel to the ground and swings upward on a ...
*Friday, October 10, 2014 at 3:23pm*

**physics**

An astronaut is traveling in a space vehicle moving at 0.520c relative to the Earth. The astronaut measures her pulse rate at 74.0 beats per minute. Signals generated by the astronaut's pulse are radioed to the Earth when the vehicle is moving in a direction perpendicular...
*Friday, October 10, 2014 at 2:47pm*

**Physics**

A highway curve with a radius of 750 m is banked properly for a car traveling 100 km/h. If a 1600- kg Porshe 928S rounds the curve at 220 km/h, how much sideways force must the tires exert against the road if the car does not skid?
*Friday, October 10, 2014 at 1:29pm*

**Physics - Flux**

The coil has a radius of 8 cm and 110 turns. While moving the magnet farther away from the coil, at a certain point in time, the voltage meter shows -390 mV. What is the magnitude of the rate of change of the flux through the coil?
*Friday, October 10, 2014 at 1:26pm*

**Physics - Conducting Rails**

Two conducting rails 39.2 cm apart rest on a 4.11° ramp. They are joined at the bottom by a 0.520 Ω resistor, and at the top a copper bar of mass 0.0450 kg is laid across the rails. The whole apparatus is immersed in a vertical 0.580 T field. What is the terminal (...
*Friday, October 10, 2014 at 1:24pm*

**Physics**

A toy gun uses a spring to shoot a ball with a mass of 5.0 g. The spring is “loaded” by compressing it 5.0 cm and has a spring constant of 288 N/m. The end of the spring is at the end of the gun (the ball does not travel any distance inside the gun after the spring) ...
*Friday, October 10, 2014 at 12:17pm*

**physics**

Imagine that you throw a ball vertically upwards from the rooftop of a building. The ball abandons your hand at a point that has the same height as the railway of the rooftop with an ascending speed of 15m/s, been left in free falling. Coming down the ball crosses the railway...
*Friday, October 10, 2014 at 10:58am*

**Physics**

I'm having a bit of trouble with this problem. A ball is thrown upwards and stays in the air for 3.65 seconds. What is the initial velocity? (I use an acceleration of -10 m/s/s) I got an answer of 18.25 m/s/s but I'm not sure that it's correct. I would love some help!
*Friday, October 10, 2014 at 10:46am*

**Physics**

A bush baby, an African primate, is capable of leaping vertically to the remarkable height of 2.3 m. To jump this high, the bush baby accelerates over a distance of 0.14m while extending the legs. The acceleration during the jump is approximately constant. What is the ...
*Friday, October 10, 2014 at 10:42am*

**physics**

A car traveling at 27 miles per hour rounds a curve such that it has a centripetal acceleration of 8.7 m/s2. To the nearest meter, what is the radius of the curve?
*Friday, October 10, 2014 at 9:55am*

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