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April 21, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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

Physics
Starting from rest, a 98-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 700 N, and his speed at the bottom of the pole is 3.4 m/s. How far did he slide down the pole?
Sunday, October 19, 2014 at 10:13pm

physics
In a cargo plane, the center of gravity must be between the front and rear landing gears in order to maintain a torque equilibrium. The front landing gears help counteract the torque provided by the rear landing gears in this case. A jet transport has a weight of 1.00 ✕...
Sunday, October 19, 2014 at 10:11pm

physics
what is the physics answer to A 25.0 kg mortar shell is launched from level ground at 38.0m/s at 60 Degrees above the horizontal. At the top of its trajectory, the shell explodes into three pieces. A 10.0 kg piece flies forward at 38.0 m/s. Another 10.0 kg piece flies straight...
Sunday, October 19, 2014 at 10:09pm

physics
The distance between two consecutive nodes of a standing wave is 19.2 cm. The hand gen- eratingthe pulses movesupand downthrough a complete cycle 3.23 times every 5.9 s. Find the velocity of the wave. Answer in units of m/s how do I solve it? thanks!
Sunday, October 19, 2014 at 10:01pm

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. ...
Sunday, October 19, 2014 at 8:56pm

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. ...
Sunday, October 19, 2014 at 8:44pm

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 ...
Sunday, October 19, 2014 at 8:36pm

Physics
  Block A and block B are forced together, compress- ing a spring (with spring constant k = 2500. N/m) between them 3.00 cm from its equilibrium length. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded...
Sunday, October 19, 2014 at 8:06pm

physics
How far from a piece of paper must you hold your father’s 2.00 D reading glasses to try to burn a hole in the paper with sunlight?
Sunday, October 19, 2014 at 6:39pm

physics
In a game of shuffleboard, a disk with an initial speed travels of 3.2m/s travels 6.0m (a) what is the acceleration of the disk? (b) what is the coefficient of friction between the floor and the disk? So far I've gotten to the equation vf^2 - vi^2 = 2a(xf-xi) because time ...
Sunday, October 19, 2014 at 6:27pm

physics
A gardener pushes a box of tools across a driveway by applying a 27.5- N force that pushes downward at an angle of 32.8 o with respect to the horizontal. How much work is done if the box moves 3.25 m in the horizontal direction?
Sunday, October 19, 2014 at 6:21pm

Physics 12
the 3 forces shown act on a object is in equilibrium. F1= 50N (E 60 degrees N), F2= 60N (E 30 degrees S ) Calculate the magnitude of the force F3 and the angle???? How to solve??
Sunday, October 19, 2014 at 6:19pm

physics
The distance between two nearest nodes of a standing wave is 22.9 cm. Hand generated pulses move up and down through a complete cycle five times every seven seconds. Find the velocity of the wave. Answer in units of m/s
Sunday, October 19, 2014 at 5:18pm

Physics
In a science fiction novel two enemies, Bonzo and Ender, are fighting in outer spce. From stationary positions, they push against each other. Bonzo flies off with a velocity of +2.2 m/s, while Ender recoils with a velocity of -2.9 m/s. Determine the ratio mBonzo/mEnder of the ...
Sunday, October 19, 2014 at 5:18pm

Physics
Consider a rod plus disc system. The rod has a total length L =1.30 m, while the disc has a radius of R = L/2. The pivot is at P where the distance between P and the end of the rod is L/4. Point O is at the center of the disc, and the distance between O and P is 0.975 m. The ...
Sunday, October 19, 2014 at 5:13pm

physics
Given. a = 25.1 cm and b = 51.2 cm and the forces are F1 = 10.3 N, F2 = 10.6 N and F3 = 14.7 N. The angle between F2 and the horizontal is θ = 27.9 °. Find the magnitude of the net torque on the wheel about the axle through O. Answer in units of N m.
Sunday, October 19, 2014 at 5:00pm

Physics fun
A golf ball strikes a hard, smooth floor at an angle of 33.1 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0172 kg, and its speed is 59.2 m/s just before and after striking the floor. What is the magnitude of the impulse applied to the ...
Sunday, October 19, 2014 at 4:39pm

Physics updated
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 65.3-kg man just before contact with the ground has a speed of 7.05 m/s. (a) In a stiff-legged ...
Sunday, October 19, 2014 at 4:20pm

Physics
A long solenoid has 1400 turns per meter of length, and it carries a current of 2.0 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of 90.0˚ with respect to the axis of the solenoid. The coil consists of 46 ...
Sunday, October 19, 2014 at 4:01pm

Physics
A solid bar of length L = 1.32 m has a mass m1 = 0.751 kg. The bar is fastened by a pivot at one end to a wall which is at an angle θ = 35.0 ° with respect to the horizontal. (in other words, the angle between the wall and the beam is 35 degrees).The bar is held ...
Sunday, October 19, 2014 at 3:59pm

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