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December 19, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics... PLEASE HELP
he thermal conductivity of concrete is 0.80 W/m-C° and the thermal conductivity of wood is 0.10 W/m-C°. How thick would a solid concrete wall have to be in order to have the same rate of flow through it as an 8.0 cm thick wall made of solid wood? (Assume both walls ...
Wednesday, October 22, 2014 at 2:17pm

physics... PLEASE HELP
en meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail? (The linear expansion coefficient for steel is ...
Wednesday, October 22, 2014 at 2:16pm

COLLEGE PHYSICS
An internal explosion breaks an object, initially at rest, into two pieces. One piece (m1) is 1.5 times more massive than the other (m2). If 7500 J were released by the explosion, how much KE did each piece acquire?
Wednesday, October 22, 2014 at 1:02pm

physics
A bear spies some honey and takes off from rest, accelerating at a rate of 1.9 m/s^2. If the honey is 17m away, How fast will the bear be going when he gets to the honey?
Wednesday, October 22, 2014 at 12:29pm

Physics
A circular loop of radius 0.10m is rotating in a uniform magnetic field of 0.20T. Find magnetic flux B F through the loop and the magnetic field vector in Figure 1 a) Are parallel b) Are perpendicular c) Are at 30o (Ans: 0, 2.0x10-3Wb, 1.0x10-3Wb ) I need the working for the ...
Wednesday, October 22, 2014 at 11:51am

physics
Superman must stop a 110-km/h train in 100m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 105 kg.
Wednesday, October 22, 2014 at 11:24am

Physics
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 810 m/s2 and the vertical or y component of its acceleration is 910 m/s2. The ball's mass is 0.32 kg. What is the ...
Wednesday, October 22, 2014 at 11:08am

Physics
A rescue plane is flying horizontally at a height of 132 m above the ground. The pilot spots a survivor and releases an emergency kit with a parachute. The kit descends at a constant vertical acceleration of and the initial plane horizontal speed is . Assuming air resistance ...
Wednesday, October 22, 2014 at 10:11am

physics
In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 33.9 m/s in a time of 6.02 s. The mass of the car and riders is 1.64 × 103 kg. Find the average net force exerted on the car and riders by the ...
Wednesday, October 22, 2014 at 9:49am

Physics
The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.5 m/s, at an angle of 52.5°...
Wednesday, October 22, 2014 at 7:30am

physics
A tank of 10m height is filled half what will be pressure at bottom
Wednesday, October 22, 2014 at 4:32am

physics
If tank of 10m height is filled half what will be pressure at bottom of tank
Wednesday, October 22, 2014 at 4:25am

physics
A plane cruising at 247 m/s accelerates at 28 m/s 2 for 8.7 s.How far will it have traveled in that time?
Wednesday, October 22, 2014 at 1:29am

physics
A car accelerates uniformly from rest to a speed of 73.6 mi/h in 7.68 s. How do i find the distance the car traveled during this time, in units of m
Wednesday, October 22, 2014 at 12:27am

physics
A car travels in a straight line for 2.8 h at a constant speed of 53 km/h . What is its acceleration? Answer in units of m/s 2
Tuesday, October 21, 2014 at 11:52pm

Physics
An airplane is flying with a velocity of 220 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.8 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle θ? I found Vox=190...
Tuesday, October 21, 2014 at 11:15pm

physics
A car accelerates uniformly from rest to a speed of 73.6 mi/h in 7.68 s. Find the constant acceleration of the car. Answer in units of m/s 2
Tuesday, October 21, 2014 at 11:11pm

Physics
Ninja goes to space! If Ninja has a weight of 83.59 N on earth and she lands on a planet that has an acceleration due to gravity of 1.44 m/s2, then what is her weight on the new planet?
Tuesday, October 21, 2014 at 10:34pm

physics
A swing sits 5 m above the ground when it is still. John lifts the swing and releases it. At its lowest point, its velocity is measured to be 5.53 m/s. How high above the ground did John lift the swing?
Tuesday, October 21, 2014 at 10:30pm

physics
An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is 1.38 m/s, and its maximum acceleration is 5.82 m/s2. How much time elapses betwen an instant when the object's speed is at a maximum and...
Tuesday, October 21, 2014 at 9:21pm

Physics help please
The lowest possible energy for a certain positively charged particle trapped in a box is 2.00 eV. (a) What are the next two higher energies a particle can have? b) Is 30 eV an allowed energy? (c) Is 32 eV an allowed energy? (d) Given the box length is 0.434 nm, what is the ...
Tuesday, October 21, 2014 at 9:20pm

Physics
A force in the +x-direction with magnitude F(x)=18.0N−(0.530N/m)x is applied to a 8.70kg box that is sitting on the horizontal, frictionless surface of a frozen lake. F(x) is the only horizontal force on the box. If the box is initially at rest at x=0, what is its speed ...
Tuesday, October 21, 2014 at 9:02pm

physics
two forces are applied to a 40kg object. one force is 50N and the other is 60N. if the forces are perpendicular to another, what will the resultant acceleration of the object be?
Tuesday, October 21, 2014 at 8:27pm

Physics
A 5.0kg box slides 8.0m down a ramp, inclined at 40degrees from the horizontal. If the box slides at constant velocity, the work done by gravity is? I used W=F*deltaX*costheta =(mg)*(deltaX)*(costheta) =(5.0)(9.8)*(8.0)* (cos50) Which I got 252 J. Is this correct?
Tuesday, October 21, 2014 at 8:11pm

Physics
While exploring the canopy of the rainforest in equatorial South America, Anastasia falls from a branch 40.0 meters high. Exactly 1.1 seconds later Joe falls from the same branch. How high above the ground is Joe when Anastasia splats into the mud below?
Tuesday, October 21, 2014 at 8:09pm

Physics
Suppose that a woman driving a Mercedes zooms out of a darkened tunnel at 33.9 m/s. She is momentarily blinded by the sunshine. When she recovers, she sees that she is fast overtaking a bus ahead in her lane moving at the slower speed of 12.0 m/s. She hits the brakes as fast ...
Tuesday, October 21, 2014 at 8:09pm

Physics
A stone is thrown downward with a speed of 12 m/s from a height of 20 m. (acceleration due to gravity: 9.81 m/s2) a) What is the speed (in m/s) of the stone just before it hits the ground? b) How long does it take (in seconds) for the stone to hit the ground?
Tuesday, October 21, 2014 at 8:07pm

physics
Two waves traveling on a string in the same direction both have a frequency of 92 Hz, a wavelength of 0.19 m, and an amplitude of 0.32 m. What is the amplitude of the resultant wave if the original waves differ in phase by pi /3 rad? What is the phase difference between the ...
Tuesday, October 21, 2014 at 8:03pm

Physics
What is the kinetic energy of an ideal projectile of mass 19.4 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 29.2 m/s and at an initial angle of 46.9° with respect to the horizontal?
Tuesday, October 21, 2014 at 8:01pm

physics
Two waves traveling on a string in the same direction both have a frequency of 92 Hz, a wavelength of 0.19 m, and an amplitude of 0.32 m. What is the amplitude of the resultant wave if the original waves differ in phase by pi /3 rad? What is the phase difference between the ...
Tuesday, October 21, 2014 at 7:43pm

Physics
A ball with mass m = 0.210 kg and kinetic energy K1 = 2.97 J collides elastically with a second ball of the same mass that is initially at rest. After the collision, the first ball moves away at an angle of = 30.6° with respect to the hori- zontal, as shown in the figure. ...
Tuesday, October 21, 2014 at 7:42pm

please help physics!!!!
Two dynamics carts are placed end to end. Cart 1 (1.2 kg) is stuck to cart 2 (1.8 kg). Cart 1 is pushed with a force of 18.9 N (west),causing cart 1 to push cart 2 forward. Ignore the force of friction. Calculate the acceleration of each cart Calculate the force that cart 1 ...
Tuesday, October 21, 2014 at 7:40pm

Physics
A ball with mass m = 0.210 kg and kinetic energy K1 = 2.97 J collides elastically with a second ball of the same mass that is initially at rest. After the collision, the first ball moves away at an angle of = 30.6° with respect to the hori- zontal, as shown in the figure. ...
Tuesday, October 21, 2014 at 7:39pm

physics
A ball is moving horizontally at 9 m/s when it leaves the edge of a table. The table is 1.64 m high. How long does it take to hit the ground?
Tuesday, October 21, 2014 at 7:37pm

Physics
A constant force, F = (4.63, −3.79, 2.16) N, acts on an object of mass 17.7 kg, causing a displacement of that object by r = (4.10, 3.86, −2.45) m. What is the total work done by this force? Im pretty sure the work equals -k(x-xo) but im not really sure what the ...
Tuesday, October 21, 2014 at 6:58pm

Physics
What is the kinetic energy of an ideal projectile of mass 19.4 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 29.2 m/s and at an initial angle of 46.9° with respect to the horizontal? I know kinetic energy equals half of mass ...
Tuesday, October 21, 2014 at 6:55pm

Physics
A father pulls his son, whose mass is 26.7 kg and who is sitting on a swing with ropes of length 3.27 m, backward until the ropes make an angle of 35.6° with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
Tuesday, October 21, 2014 at 6:39pm

Physics
A father pulls his son, whose mass is 26.7 kg and who is sitting on a swing with ropes of length 3.27 m, backward until the ropes make an angle of 35.6° with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
Tuesday, October 21, 2014 at 6:38pm

Physics
After pushing a 22.2 kg kid and tricycle over 10.3 m of smooth, level sidewalk from rest, the "combo" is moving at 3.0 m/s. Find the combo's kinetic energy
Tuesday, October 21, 2014 at 6:34pm

Physics
A mass of 2.63 kg is attached to a string tied to a hook in the ceiling. The length of the string, L, is 0.8 m, and the mass is released from rest at an initial position in which the string makes an angle θ of 40.4o with the vertical. Calculate the work (in J) done by ...
Tuesday, October 21, 2014 at 6:31pm

Physics
Mike is piloting a lear jet traveling at 207.8 m/s. He accelerates at 15.6 m/s2 over a distance of 2275 meters. How fast will the jet be moving at the end of this acceleration?
Tuesday, October 21, 2014 at 6:06pm

Physics
Sanjay's air boat starts from rest and accelerates at 4.6 m/s2 for a distance of 219 meters. How fast is it moving at the end of the 219 meters?
Tuesday, October 21, 2014 at 6:06pm

Physics
How far will a motorcycle driven by Emily travel, if it is initially moving at 14.8 ft/s and accelerates uniformly at 11.3 ft/s2 for 6.6 seconds? My teacher never gave us equations to use when solving this king of problem.
Tuesday, October 21, 2014 at 6:05pm

please help! physics
A 1200 kg car is moving at 95 km/h when the driver notices a deer down the road. He immediately moves his foot toward the brake pedal, taking only 0.50 seconds before the car starts slowing down. The brakes cause a net force of 2400 N (backwards) on the car for 2.0 seconds. ...
Tuesday, October 21, 2014 at 5:02pm

Physics
If I dropped a bowling ball from the empyre state building, at what velocity would it descend?
Tuesday, October 21, 2014 at 4:39pm

physics... PLEASE HELP
An elephant can hear sound with a frequency of 15.0 Hz. What is the wavelength of this wave? The speed of sound in air is 343 m/s.
Tuesday, October 21, 2014 at 4:02pm

physics
Thirty microcoulombs of NEGATIVE charge experiences an electrostatic force of 27. mN. What is the magnitude and direction of the electric field?
Tuesday, October 21, 2014 at 3:48pm

physics
The sugar concentration in a solution (e.g., in a urine specimen) can be measured conveniently by using the optical activity of sugar and other asymmetric molecules. In general, an optically active molecule, like sugar, will rotate the plane of polarization through an angle ...
Tuesday, October 21, 2014 at 3:47pm

physics
Under what circumstances, if any, will a converging lens form an inverted image of a real object? Under what circumstances, by itself, will a diverging lens form an erect image of a real object?
Tuesday, October 21, 2014 at 3:12pm

physics
2) A bullet of mass m1 = 0.01 kg and velocity v = 100 m/s is fired into a 100 kg block of ice and gets stuck. How fast does the ice move after the bullet impacts it?
Tuesday, October 21, 2014 at 3:05pm

Physics
Two hockey players traveling at 12 m/s (Player #1) and 19 m/s (Player #2) hit in a head-on collision. They grab onto each other to keep from falling and slide in the same direction Player #2 was traveling at a speed of 5 m/s. Player #1 has a mass of 100 kg. What is Player #2&#...
Tuesday, October 21, 2014 at 2:35pm

Physics
I am really confused on the steps to solve this problem. This is my first time taking physics. The much needed help, would be strongly appreciated. a) Calculate the centripetal force exerted on a vehicle of mass m = 1630 kg that is moving at a speed of 13.9 m/s around a curve ...
Tuesday, October 21, 2014 at 1:07pm

physics
The sugar concentration in a solution (e.g., in a urine specimen) can be measured conveniently by using the optical activity of sugar and other asymmetric molecules. In general, an optically active molecule, like sugar, will rotate the plane of polarization through an angle ...
Tuesday, October 21, 2014 at 12:28pm

physics
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail?
Tuesday, October 21, 2014 at 12:26pm

physics
Two blocks with masses m1 = 13.4 kg and m2 = 74.2 kg, shown in the figure, are free to move. The coefficient of static friction between the blocks is 0.55 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against m2?
Tuesday, October 21, 2014 at 11:23am

Physics
A car is parked 23.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 59.0 m/s. The train sounds a short blast of its 340-Hz horn when it reaches a point 23.0 m west of the crossing. What frequency ...
Tuesday, October 21, 2014 at 11:18am

physics
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail?
Tuesday, October 21, 2014 at 10:46am

physics
A stunt pilot is attempting to drop a water balloon from a moving airplane onto a target on the ground. The plane moves at a speed of 75.2 m/s and a 47° above the horizontal when the balloon is released. At the point of release, the plane is at an altitude of 520 m. (a) ...
Tuesday, October 21, 2014 at 10:40am

physics... PLEASE HELP
An elephant can hear sound with a frequency of 15.0 Hz. What is the wavelength of this wave? The speed of sound in air is 343 m/s.
Tuesday, October 21, 2014 at 10:28am

Physics
How would you set this up? A 250-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 28° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
Tuesday, October 21, 2014 at 10:11am

Physics
An astronaut jumps on the moon with an initial upward velocity of 4.35m/s. If the acceleration of gravity on the moon is -1.62m/s^2, what is the max height of the astronaut?
Tuesday, October 21, 2014 at 9:41am

physics
Someone in a car going past you at the speed of 35 m/s drops a small rock from a height of 1.5 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. Answer in units of m.
Tuesday, October 21, 2014 at 9:21am

physics
the mass of a stone is 15.0g when completely immersed in water and 10.0g when completely immersed in a liquid of relative density 2.0. what is the mass of the stone in air
Tuesday, October 21, 2014 at 9:17am

Physics
1. A body was dropped from a building 10-m high. Its kinetic energy before reaching the ground is 980 J. What is the mass of the body? 2. A 1.0-kg block slides down a rough inclined plane whose height is 1.0 m. At the bottom the block has a speed of 4.0 m/s. Is mechanical ...
Tuesday, October 21, 2014 at 6:19am

physics
A swimmer can swim in still water at a speed of 9.47 m/s. He intends to swim directly across a river that has a downstream current of 4.24 m/s. a) How many degrees from straight across the river should he head? Let upstream be a positive angle. Answer in units of ◦
Tuesday, October 21, 2014 at 12:49am

Physics
Suppose the surface (radius = r) of a cylindrical space station is rotating at 29.1 m/s to provide artificial gravity. What must be the value of r for the astronauts to weigh 1/3 of their earth weight? Don't know how to start please help.
Monday, October 20, 2014 at 11:35pm

physics
what is the work with a force of 19.3 N and a displacement 7 m and an angle of 80.0
Monday, October 20, 2014 at 11:28pm

Please physics help
A 0.0124-kg bullet is fired straight up at a falling wooden block that has a mass of 3.96 kg. The bullet has a speed of 756 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision...
Monday, October 20, 2014 at 10:55pm

Physics
1.) A ball is thrown straight upwards at a speed of 32.5 m/s and from a height of 1 m above the ground. How long before it hits the ground? 2.) An astronaut jumps on the moon with an initial upward velocity of 4.35m/s. If the acceleration of gravity on the moon is -1.62m/s^2, ...
Monday, October 20, 2014 at 10:50pm

physics
It takes 242 kJ of work to accelerate a car from 20.2 m/s to 28.2 m/s. What is the car's mass?
Monday, October 20, 2014 at 10:28pm

Physics
This is a question related to work. Today we had a pop quiz in my physics class and I am just trying to check my work here :D 1) if there is a 5 kg block on a horizontal table connected with string to a 3 kg block hanging off the side of the table through a pulley. Assume the ...
Monday, October 20, 2014 at 10:27pm

physics
After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.7 m/s. Miranda runs after her at a velocity of +5.0 m/s and hops on the inner tube. How fast do the two of them slide across the snow together on ...
Monday, October 20, 2014 at 9:28pm

please help! physics
A block of mass m is pushed along a horizontal table by a force F= 70 N at an angle 55 degrees with the horizontal. The coefficient of kinetic friction is 0.3
Monday, October 20, 2014 at 8:44pm

Physics
A man (mass 120.5 kg) is canoeing with his friend (mass 81.6 kg). He had the only paddle but dropped it in the lake. It has drifted just out of his reach along the long axis of the canoe. His friend suggests that if they trade places he might be able to reach the paddle. The ...
Monday, October 20, 2014 at 8:28pm

Physics
A 0.0124-kg bullet is fired straight up at a falling wooden block that has a mass of 3.96 kg. The bullet has a speed of 756 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision...
Monday, October 20, 2014 at 8:20pm

Physics
A car drives straight down toward the bottom of a valley and up the other side on a road whose bottom has a radius of curvature of 110m . At the very bottom, the normal force on the driver is twice his weight. At what speed was the car traveling?
Monday, October 20, 2014 at 7:06pm

physics
A small girl of weight 150N is placed on the centre of the plank. She then walks to the right and goes past trestle Q. When the plank is on the point of tipping up, where will the fulcrum be?
Monday, October 20, 2014 at 6:43pm

physics
A block of mass m is pushed along a horizontal table by a force f=70 N at an angle 55 degrees with the horizontal. Yhe coefficient of kinetic friction is 0.3 Find the normal force. My work: I know that there is 3 forces present: force of gravity, normal and applied. I think ...
Monday, October 20, 2014 at 6:38pm

Physics
A crate is pulled by a rope making 30 degrees with the horizontal. If the work done to move it in 15 m is 2000 J, find the tension in the rope.
Monday, October 20, 2014 at 5:36pm

Physics
The power output of an elevator is 15000 W. How many persons could it carry if it raises passenger to a height of 35 m in 20 s ( each person has an average mass of 60 kg)?
Monday, October 20, 2014 at 5:27pm

Physics
In a constant-pressure calorimeter, 75.0 mL of 0.810 M H2SO4 was added to 75.0 mL of 0.390 M NaOH. The reaction caused the temperature of the solution to rise from 22.68 °C to 25.34 °C. If the solution has the same density and specific heat as water, what is ΔH ...
Monday, October 20, 2014 at 4:49pm

Physics
A 70 kg woman pushes on a wall at 35 newtons and recoils. What is the magnitude of the force?
Monday, October 20, 2014 at 3:19pm

Physics 30
A 6.8 g bullet travelling at 395m/s goes through a stationary block of wood in 4.3 *10^-4 and emerges at 102 m/s. what average force did the wood exert on the bullet ? how thick is the wood?
Monday, October 20, 2014 at 3:19pm

physics
A centrifugal pump pumps 100 lbs/hr of water 100 ft high to the top nozzle of a distillation column. The pump impeller is 3 ft diameter?
Monday, October 20, 2014 at 3:12pm

physics
Curve A is banked at 11.2 °, and curve B is banked at an angle of 15.2 °. A car can travel around curve A without relying on friction at a speed of 14.5 m/s. At what speed can this car travel around curve B without relying on friction? Do I need to find radius in ...
Monday, October 20, 2014 at 2:59pm

physics
A 80kg crate Is pushed 35m across the floor with a force of 500n the coefficient of kinetic friction is 0.25 how much for is done on the crate by pushing it"
Monday, October 20, 2014 at 12:59pm

physics
A long, straight, current-carrying wire runs from north to south. If you know the direction of the current, how can you determine the direction of the magnetic field? a. Grasp the wire in your right hand with the thumb in the direction of the current, the four fingers will ...
Monday, October 20, 2014 at 12:46pm

Physics
a boat moves through the water of a river at 5.8m/s relative to the water, regardless the boat's direction. if the current is flowing at 5.04m/s, how long does it take the boat it take the boat to complete a trip consisting of a 443m displacement downstream followed by a ...
Monday, October 20, 2014 at 12:36pm

Physics
Two forces 3N and 4N on a body in directions due North and due East respectively.Calculate their equilibrant.
Monday, October 20, 2014 at 12:07pm

physics
A shop prepares fresh takeout where 40 baked chicken dinners were prepared at a cost of $3.20 each. A 20% spoilage rate is anticipated. The shop sells the dinners at an 80% markup based on cost. They decide to offer a $1-off coupon in a newspaper ad so, what markdown ...
Monday, October 20, 2014 at 11:18am

Physics
A 27.9 kg block (m1) is on a horizontal surface, connected to a 5.3 kg block (m2) by a massless string. The pulley is massless and frictionless. A force of 239.3 N acts on m1 at an angle of 28.9°. The coefficient of kinetic friction between m1 and the surface is 0.181. ...
Monday, October 20, 2014 at 9:55am

Physics
A 4.58 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.5 N at an angle theta = 25.5° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.09. What distance does the block travel in a time of 5....
Monday, October 20, 2014 at 9:48am

physics
100 kg jeepney is at reast on a bridge 5m from the right end, neglecting the weight of the bridge. find f1 and f2
Monday, October 20, 2014 at 8:26am

physics
how many kcals are required to cool one gallon/liter of water from 32degrees celcius to 7 degrees celcius?
Monday, October 20, 2014 at 7:12am

physics
a point charge q is located btween two earthed intersecting conducting planes that are inclined at 60 degree to each other .determine the number of image charges and their location .
Monday, October 20, 2014 at 7:08am

physics
Car A uses tires for which the coefficient of static friction is 0.333 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 13.8 m/s. Car B uses tires for which the coefficient of static friction is 0.843 on the same curve. What is the...
Monday, October 20, 2014 at 3:29am

physics
The mass of the sled and its two riders in Figure 5.5 is 243 kg. Find the magnitude of the centripetal force that acts on the sled during the turn with a radius of (a) 33.0 m and (b) 24.0 m.
Monday, October 20, 2014 at 2:00am

Physics: mechanics
A 250g bullet with a speed of 500m/s passes through the center of a 1.5kg square wooden block [ side length 18cm] at rest upon a horizontal frictionless surface. As it exits the block, the bullet has a speed of 150m/s. A) find the initial speed of the center of mass of the ...
Monday, October 20, 2014 at 1:15am

physics
An object slides on a level surface in the +x direction. It slows and comes to a stop with a constant acceleration of -2.45 m/s2. What is the coefficient of kinetic friction between the object and the floor? (please include explanation)
Monday, October 20, 2014 at 1:04am

physics
A 2.44 kg object is subjected to three forces that give it an acceleration vector a = -(8.00 m/s2)i hat + (6.00 m/s2)j hat. If two of the three forces are vector F1 = (30.7 N)i hat + (17.0 N)j hat and vector F2 = -(12.0 N)i hat + (8.00 N)j hat, find the third force.
Sunday, October 19, 2014 at 10:28pm

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