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March 27, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
A small coin, initially at rest, begins falling. If the clock starts when the coin begins to fall, what is the magnitude of the coin\'s displacement between t1 = 0.230 s and t2 = 0.517 s?
Monday, February 2, 2015 at 9:06pm

Physics
While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 7.65 m/s. The stone subsequently falls to the ground, which is 12.7 m below the point where the stone leaves your hand. At what speed does the stone impact the ground? How ...
Monday, February 2, 2015 at 9:05pm

Physics
A proton travelling 1.5x10^6 m/s enters 2 vertically charged parallel plates held 0.15m apart. The top plate is held at +250V and the bottom is grounded (0V). A magnetic field can be applied to the area between the plates to counteract the electric force acting on the proton. ...
Monday, February 2, 2015 at 8:53pm

Physics
From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.50 m/s and angle of 23.0° below the horizontal. It strikes the ground 6.00 s later. If the base of the building is taken to be the origin of the coordinates, ...
Monday, February 2, 2015 at 8:47pm

Physics
A thickness planer is a machine that uses a rotating blade to shave a thin layer of wood off the top of the surface. While operating, a piece of wood is inserted such that it causes the machine to struggle and slow down due to resistance of the lumber. Curiously, the 15 amp ...
Monday, February 2, 2015 at 8:43pm

Physics
7. An early objection to the idea that the earth is spinning on its axis was that the earth would turn so fast at the equator that people would be thrown into space. Show the error in this logic by calculating the centripetal force needed to hold a 100. kg person in place at ...
Monday, February 2, 2015 at 8:41pm

Physics
A neighbourhood requires 1.5 x 10^5 w of electricity to power all homes during peak usage times. A step-down transformer is used on the high voltage transmission lines to lower the voltage to 120v for household use. There are 25000 primary coils and 140 secondary coils on the ...
Monday, February 2, 2015 at 8:39pm

Physics
A 45.0 g arrow moving North at 134 m/s strikes a 1.50 kg bale of straw initially at rest. The arrow passes through the bale, leaving at 78.0 m/s. What is the velocity of the bale when the arrow leaves?
Monday, February 2, 2015 at 8:37pm

Physics
A 5.0 amp current flows through a 0.20m long solenoid with 1500 loops What are the magnitude and direction of the magnetic field at the centre of the solenoid?
Monday, February 2, 2015 at 8:36pm

Physics
A 2.0 kg mass is attached to a string that is 1.0 m long and moves in a horizontal circle at a rate of 4.0 revolutions per second. a) What is the centripetal acceleration of the mass? I converted 4 rev/s to 25.13 rad/s and used the equation: a=rw^2 to get 632 m/s^2 b) What is ...
Monday, February 2, 2015 at 8:05pm

Physics
A racing car has a mass of 1770 kg. The acceleration of gravity is 9.8 m/s2 . What is its kinetic energy if it has a speed of 133 km/h? Answer in units
Monday, February 2, 2015 at 7:21pm

Physics
A small bag of sand is released from an ascending hot-air balloon whose upward constant velocity is v0 = 1.45 m/s. Knowing that at the time of the release the balloon was 70.3 m above the ground, determine the time, τ, it takes the bag to reach the ground from the moment ...
Monday, February 2, 2015 at 6:05pm

Physics
A 4.03-kg object is thrown vertically upward from the surface of Earth, where the acceleration due to gravity is g1 = 9.81 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of ...
Monday, February 2, 2015 at 6:00pm

Physics
Question 1:A child's wagon with a mass of 11 kg is moving at a constant speed of 4 m/s on a horizontal frictionless surface at the Houston Zoo. After a 4.2 kg Southern Ground Hornbill lands by vertical descent in the child's wagon, the velocity of the wagon will be ...
Monday, February 2, 2015 at 5:45pm

Physics
A paladin howitzer fires a 46.00 kg projectile towards a 1000 kg metal block resting on a frictionless surface. Just before impact, the projectile is traveling with a horizontal velocity of 529 m/s. After the collision, the embedded projectile and the metal block move along ...
Monday, February 2, 2015 at 5:40pm

Physics
While sliding horizontal on a frictionless surface at a speed of 30 m/s, a hockey puck of mass 0.16 kg is struck by a hockey stick. After leaving the stick, the puck has a speed of 22 m/s in the opposite direction. The magnitude of the impulse given to the puck is _____ N s.
Monday, February 2, 2015 at 5:15pm

physics
Tarzan is running towards a cliff, ready to swing down rescue Jane from some poisonous snakes, and make it back up to a tree on the other side. For now, we are going to assume energy is conserved and ignore momentum. If the height of the cliff is 10m, the height of the tree on...
Monday, February 2, 2015 at 5:02pm

physics
Consider the following system with a 2 kg mass sitting on a table, connected to both 1 kg and 3 kg masses by strings which go over two separate pulleys and are pulling on the 2 kg mass in opposite directions. What static friction coefficient would be required between the 2 kg ...
Monday, February 2, 2015 at 4:58pm

physics
Consider a modified Atwood machine, with a mass sitting on an inclined plane connected by a string which stretches over a pulley connected to a hanging mass. Friction is ignored. Draw a free body diagram for both blocks. Apply Newton's second law to both blocks. If the ...
Monday, February 2, 2015 at 4:55pm

Integrated Physics and Chemistry
What are a few of the positive things the Equal Rights Amendment would have done for women in America?
Monday, February 2, 2015 at 4:26pm

physics
The figure below shows three charges at the corners of a rectangle of length x = 0.65 m and height y = 0.42 m. What is the electric potential at the center of the rectangle? the picture is of a rectangle with -6.1,+2.7,-3.3 as charges. Your submitted answer is : -4.67e4 V I ...
Monday, February 2, 2015 at 4:20pm

Physics
A 447.5-N force accelerates a go-cart and its driver from 10.3 m/s to 16.7 m/s in 4.01 s. What is the mass of the go-cart plus driver?
Monday, February 2, 2015 at 3:58pm

physics
1. A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work? (Points : 1) 0.00 N 10.0 N 17.3 N 20.0 N Question 2.2. A man carries a 10 kg sack of ...
Monday, February 2, 2015 at 3:22pm

physics
Water is poured into a container that has a small leak.The mass 'm' of the water is given as a function of time 't' by,m=5t^0.8 -3t + 20 , with t>=0, t in seconds: A) at what time is the water mass greatest, B) what is the greatest mass? *In kilogram per ...
Monday, February 2, 2015 at 2:59pm

Physics
As it passes over Grand Bahama Island, the eye of a hurricane is moving in a direction 57.0° north of west with a speed of 40.0 km/h. (Let i hat represent east and j hat represent north.) (a) What is the unit-vector expression for the velocity of the hurricane? It ...
Monday, February 2, 2015 at 2:43pm

Physics
PHYS1111_HMWK02_Vectors_and_2DKinematics​ » Eddie the Eagle Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 62.2 m horizontally from the ...
Monday, February 2, 2015 at 1:04pm

Physics
A golfer, standing on a fairway, hits a shot to a green that is elevated 5.50 m above the point where she is standing. The ball leaves her club at an angle of 37.0° above the ground, with a speed of 31.1 m/s. Find the time that the ball is in the air before it hits the ...
Monday, February 2, 2015 at 12:29pm

Physics
Suppose that the amount of heat removed when 2.9 kg of water freezes at 0.0 oC were removed from ethyl alcohol at its freezing/melting point of -114.4 oC. How many kilograms of ethyl alcohol would freeze? I don't know where to start with this question! Please help.
Monday, February 2, 2015 at 11:34am

physics
Bob is sitting a subway train going south at speed of 2.50 m/s. Morgan is walking towards her down the center aisle of the train. To jen, standing on the platform, Morgan seems to be moving at a speed of 2.75 m/s to the south. How fast and in what direction is Morgan moving, ...
Monday, February 2, 2015 at 11:25am

physics
Air becomes conducting when the electric field strength in a region exceeds 3x106 V/m. if a spark jumps between a charged object and a grounded object when the two objects are 10 cm apart, what is the potential difference between the two objects? If a lightning strike is 4x103...
Monday, February 2, 2015 at 11:18am

Physics
Find the work that should be done to increase the distance between two point charges with the charges of 5nC and -10nC by 5cm. The initial distance between the charges is 15cm.
Monday, February 2, 2015 at 11:09am

Physics
Find the potential energy of a system often point charges. 7nC and 2nC separated by 0.03m
Monday, February 2, 2015 at 11:03am

physics
The sum of magnitudes of two forces is 16N.if the resultant force is 8N and its direction is perpendicular to minimum force then the forces are: (a)6N,10N(b)8N,8N(c)4N,12N(d)2N,14N
Monday, February 2, 2015 at 10:39am

college physics
two forces act simultaneously on a box. one pulls with a force of 12 pounds due south. the other pulls with a force of 8 pounds in a direction 20 degrees north od east. what is the resultant of these two forces?
Monday, February 2, 2015 at 10:17am

physics
A space satellite has a total mass of 500kg. A portion of mass 20kg is ejected a velocity of 10ms-1 . Calculate the recoil velocity of the remaining portion (ignoring the initial velocity of the satellite).
Monday, February 2, 2015 at 10:06am

Physics
A person weighs 150 N on the moon. If the acceleration due to gravity on the moon is 1.63 m/s2, what is the mass of the person?
Monday, February 2, 2015 at 9:50am

physics
a rock is thrown vertically upward from ground level at t=0. At t= 1.5s, it passes the top of a tall tower and 1.0 s later, it reached its maximum height. what is the height of the tower?
Monday, February 2, 2015 at 7:25am

Physics Kinematics
A basketball is launched with an initial speed of 12.0 m/s at 45 degrees from the ground. The height of the basket y = 2.50m. From what distance x the ball is shot? Note : The trajectory is like a basketball shot, the highest point the ball reaches is higher than the basket ...
Monday, February 2, 2015 at 1:47am

Physics Kinematics
A puck slides across a smooth, level tabletop at height H at a constant speed Vo. It slides off the edge of the table and hits the floor a distance x away. What is the algebraic relationship between the distances x and H?
Monday, February 2, 2015 at 1:45am

Physics
A rock is thrown horizontally from a bridge with a velocity of 13.0 m/s. It takes the rock 3.5 s to strike the water below. What is the magnitude of the velocity of the rock just before it hits the water?
Monday, February 2, 2015 at 1:41am

physics
A small block with mass 0.308 kg is sliding down a frictionless ramp that is inclined at an angle of 53.1° above the horizontal. Assume g = 9.80 m/s2. (a) As the object slides down the incline, what is the magnitude of the normal force that the surface of the incline ...
Monday, February 2, 2015 at 12:05am

Physics
In a particular crash test, an automobile of mass 1295 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 25 m/s and 1.5 m/s, respectively. If the collision lasts for 0.11 s, find the magnitude of the ...
Sunday, February 1, 2015 at 11:55pm

physics
A small block is released from rest at the top of a frictionless incline. The distance from the top of the incline to the bottom, measured along the incline, is 3.70 m. The vertical distance from the top of the incline to the bottom is 1.67 m. If g = 9.80 m/s2, what is the ...
Sunday, February 1, 2015 at 11:54pm

Physics
In exercise physiology studies, it is sometimes important to determine the location of a person's center of gravity. This can be done with the arrangement shown in the figure below. A light plank rests on two scales that read Fg1 = 440 N and Fg2 = 320 N. The scales are ...
Sunday, February 1, 2015 at 11:23pm

Physics
Three vectors of lengths A = 45.6, B = 24.2, and C = 30.4. The angles are θa = 29.6° and θb = 57.5°, and C points along the negative y-axis. Determine the length of the vector A - C. Calculate the angle of this vector. Determine the length of the vector A - B...
Sunday, February 1, 2015 at 11:22pm

Physics
A batter hits a baseball so that it leaves the bat with initial speed of 40 m/s, at an angle of 60°. Tom Brady throws an incomplete pass at an initial speed of ~ 60 miles/hour (mph). When the ball was released, it’s initial velocity made an angle of ~45° with ...
Sunday, February 1, 2015 at 11:20pm

Physics
An object fired at an angle of 31.9° above the horizontal takes 2.55 s to travel the last 15.5 m of its vertical distance and the last 10.5 m of its horizontal distance. With what speed was the object launched? (Note: This problem does not stipulate that the initial and ...
Sunday, February 1, 2015 at 11:19pm

physics
An astronaut visits a moon of Saturn, and decides to measure the accel. of gravity. He ties a rock (m=2 kg) to a rope (1.25 m), pulls the rock back 10 degrees, and releases it into simple harmonic motion. What is the accel due to gravity on the moon? (*I have no idea where to ...
Sunday, February 1, 2015 at 11:07pm

Physics 131
A -2.72 ìC charge is placed at the center of a conducting spherical shell, and a total charge of +6.35 ìC is placed on the shell itself. Calculate the total charge on the outer surface of the conductor.
Sunday, February 1, 2015 at 11:00pm

Physics
1) If = 2.0 cm, due E and = 5.0 cm, due W Determine: a) R = -A + 2B b) V = - 2A - B c) F = 3A - B My Answers R= 8, V= -1, F= 1 Is this correct and how do you know when direction it's going to be?
Sunday, February 1, 2015 at 8:28pm

Physics
Suppose you have a 5nC charge T the origin and a 2nC charge at x=5m. Find the location on the x axis where the electric field is 0. (Find finite coordinate location)
Sunday, February 1, 2015 at 7:31pm

physics
A block of mass 3.17 kg is hanging from a rope. The tension in the rope is 12.9 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block?
Sunday, February 1, 2015 at 6:59pm

Physics
A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The bat acts on the ball for 0.016 s. What is the magnitude of the impulse imparted by the bat to the ball? Answer in units of N · s. What is the...
Sunday, February 1, 2015 at 5:41pm

Physics
A projectile is launched with an initial speed V0. At its highest point, the projectile's speed is V0/2 . What was the launch angle above the horizontal? (in deg)
Sunday, February 1, 2015 at 5:40pm

Physics
A place kicker must kick a football from a point 35.0 m (= 38.3 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 19.8 m/s at an angle of 45.0o to the horizontal. By how much does the ball ...
Sunday, February 1, 2015 at 4:45pm

Physics
A projectile is launched with an initial speed . At its highest point, the projectile's speed is . What was the launch angle above the horizontal? (in deg)
Sunday, February 1, 2015 at 4:44pm

Physics
Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 62.2 m horizontally from the edge of the ramp. His velocity just before landing is 29.0 m/s and points ...
Sunday, February 1, 2015 at 4:43pm

Physics
A golfer, standing on a fairway, hits a shot to a green that is elevated 5.50 m above the point where she is standing. The ball leaves her club at an angle of 37.0° above the ground, with a speed of 31.1 m/s. Find the time that the ball is in the air before it hits the ...
Sunday, February 1, 2015 at 4:42pm

physics
A 25 kg cannon ball is fired from a cannon with muzzle speed of 1520 m/s at an angle of 35.5 ◦ with the horizontal. The acceleration of gravity is 9.8 m/s 2 . Use conservation of mechanical energy to find the maximum height reached by first ball. Answer in units of m. I ...
Sunday, February 1, 2015 at 3:33pm

physics
a car has a mass of 820 kg. It starts from rest and travels 41 m in 3.0s. What is the net force applied to the car?
Sunday, February 1, 2015 at 3:12pm

physics
A 130 cm length of string has a mass of 3.94 g. It is stretched with a tension of 8.60 N between fixed supports. What is the wave speed for this string?
Sunday, February 1, 2015 at 2:51pm

physics
You are constructing a mobile out of 5 identical toy helicopters, each of mass m = 25.3 g, 4 identical sticks (each length l = 21.2 cm, and negligible mass), and thin string of negligible mass. The distance from the left-hand side of each stick to the attachment point of the ...
Sunday, February 1, 2015 at 2:35pm

physics
a particle is subjected to two displacement as follows: 30m to the northeast and 40m to northwest. what must be third displacement if the particle is to end up at the starting point
Sunday, February 1, 2015 at 2:17pm

physics
The effective k of the diving board shown here is 1675 N/m. A heavy diver is bouncing up and down at the end of the diving board. With what frequency does he bounce up and down? How long does it take for him to complete one bounce (up and down)? What is the mass of the man? I ...
Sunday, February 1, 2015 at 1:54pm

Physics
You are given two unknown point charges, Q1 and Q2. At a point on the line joining them, one-third of the way from Q1 to Q2 the electric field is zero . What is the ratio Q1/Q2?
Sunday, February 1, 2015 at 1:54pm

Physics
A spring fixed to a wall is attached to a 6 kg block of wood on the other end. The block rests on a frictionless surface. The spring with spring constant 100 N/m is compressed by 0.1 m and releases. With what frequency and period will the block/spring system oscillate? -I drew...
Sunday, February 1, 2015 at 1:48pm

physics
Imagine a grandfather clock. When the clock swings all the way to the right it 'ticks', when it swings all the way to the left it 'rocks'. If you wanted the time between the tocks and ticks, what length should the pendulum be? And, if you took the pendulum to ...
Sunday, February 1, 2015 at 1:41pm

physics
A friend plays an A note (440 Hz) on her piccolo while running towards you at 40 m/s. What frequency do you hear just before she runs into you? -I am not sure where to start on this problem. I wrote down the givens: fs=440 hz, vs=40 m/s, v=343 m/s. and I'm trying to solve ...
Sunday, February 1, 2015 at 1:37pm

Physics
In a particular crash test, an automobile of mass 1295 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 25 m/s and 1.5 m/s, respectively. If the collision lasts for 0.11 s, find the magnitude of the ...
Sunday, February 1, 2015 at 1:19pm

physics
A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The bat acts on the ball for 0.016 s. What is the magnitude of the impulse imparted by the bat to the ball? Answer in units of N · s. 011 (part 2...
Sunday, February 1, 2015 at 1:12pm

Physics
A cannonball is shot upwards with a total velocity of 61.0 m/s at an angle of 45 degrees from the horizontal. What will its total velocity be when it has moved 345 m horizontally from where it started?
Sunday, February 1, 2015 at 12:50pm

physics
A swimmer can swim 1.7 mph in still water. She decides to swim upsteam against the current which is 0.7 mph. It will take the swimmer ___ hours to travel 8 miles as measured by a person standing on the river bank.
Sunday, February 1, 2015 at 12:50pm

physics
A hammer falls from a scaffold on a building 50.0 m above the ground. Find its speed as it hits the ground.
Sunday, February 1, 2015 at 11:59am

Physics
Riding in an elevator, a man notices that he feel heavier or lighter based when the elevator speeds up or slows down. He stands on a bathroom scale in the elevator to take some measurements. Assume that his mass is 85 kg. a. What is this man’s weight while at rest? b. ...
Sunday, February 1, 2015 at 11:13am

physics
Using the following number: 26,802 In 4 significant figures, this number would be Answer. In 3 significant figures, this number would be Answer. In 2 significant figures, this number would be Answer. In 1 significant figure, this number would b
Sunday, February 1, 2015 at 10:32am

PHYSICS
without air resistance maximum range of projectile is obtained with an angle of ???? Can you please fill in the blank THANK YOU
Sunday, February 1, 2015 at 9:37am

physics
a projectile with a horizontal component of 13m/s and a vertical component of 18 m/s would have an overall velocity of m/s??? at and angle of ?? above the horizontal. Can you please help me fill in the two blanks thank you
Sunday, February 1, 2015 at 9:35am

physics
a copper cylinder has a radius of 2.5 cm and a length of 5.6 cm at 20 degree Celsius. The rod is heated until its temperature is 85 degree Celsius. Find the density at 85 degree Celsius.
Sunday, February 1, 2015 at 9:33am

physics
Water is lifted from a well of depth 50m. If mass of water is 20kg and that of the rope is 0.2kg per metre the amount of work done is
Sunday, February 1, 2015 at 8:14am

Physics
A 6.5-kg bowling ball thrown with a speed of 5.4 m/s hits a stationary 1.75-kg pin. What is the velocity of each object? Assume that the coefficient of restitution is 0.75.
Sunday, February 1, 2015 at 7:28am

Physics
Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate the net force on the left charge due to the other two.
Saturday, January 31, 2015 at 11:55pm

Physics
In the picture to the right, a ring pulls a box of mass m = 5.0 kg across a level table. The string pulls with a tension F = 25.0 N at an angle θ = 25˚ above the horizontal. A frictional force of 4.0 N also acts on the box. Calculate a. the normal force on the box. b...
Saturday, January 31, 2015 at 11:10pm

Physics
A bird sits at rest in the middle of a wire. The wire slopes upward at 5* from the horizontal on either side of the bird. If the wire on both sides of the bird is experiencing a tension force of 106 N, then what is the mass of the bird?
Saturday, January 31, 2015 at 10:43pm

physics
An athlete performing a long jump leaves the ground at a 27.1∘ angle and lands 7.72m away 1.What was the takeoff speed? 2.If this speed were increased by just 5.0%, how much longer would the jump be?
Saturday, January 31, 2015 at 9:47pm

physics II
A rocket is launched vertically from ground with a constant acceleration. If the rocket emits a burst of sound every five seconds after launching, find the difference of intensity levels observed at the launching site for the first and the second bursts of sound.
Saturday, January 31, 2015 at 6:02pm

Physics II
Please can anyone explain. Thank you. A rocket is launched vertically from ground with a constant acceleration. If the rocket emits a burst of sound every five seconds after launching, find the difference of intensity levels observed at the launching site for the first and the...
Saturday, January 31, 2015 at 3:30pm

Physics
the charge on a pith ball was measured as +40 nC. if the charge on an electron is -1.6 x 10^-19, how many electrons have been added or removed from the ball?
Saturday, January 31, 2015 at 2:19pm

Physics
The space shuttle is in a 3e+5 m high orbit over the earth. The radius of the earth is 6.37e+6 m, the mass of the earth is 5.98e+24 kg. What is the distance from the center of the earth to the space shuttle? I don't know whether I would double the radius and the add the ...
Saturday, January 31, 2015 at 11:09am

Pure math,Life science,Geography and History
Hi I'm grade10 and I was wondering if you's could help Me to get a career examples after matric because my school took away our Physics for unknown reasons so insted of Physics or another subject that would help you in the future they gave us History please help me ...
Saturday, January 31, 2015 at 6:54am

physics
Three point charge are located at a line 20cm with charge q1= -3uC, q2= +4uC, q3= -7uC. Determine the magnitude of the force.
Saturday, January 31, 2015 at 5:46am

Physics
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 68.5 N, Jill pulls with 61.3 N in the northeast direction, and Jane pulls to the southeast with 111 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
Saturday, January 31, 2015 at 2:03am

Physics
Ali and hid father sit at the ends of a see-saw, 2 m from the pivot, as shown in figure 5.12. Where should ali's mother sit in order to balance the see-saw?
Friday, January 30, 2015 at 11:26pm

Physics
Two point charges Q1=-6.80nC and Q2 = -5.80nC are separated by 33.0cm. What is potential energy of the pair? Answer in units of Joules.
Friday, January 30, 2015 at 11:26pm

Physics
Ali and his father sit at the ends of a see-saw, 2 m from the pivot, as shown in figure 5.12. Where should ali's mother sit in order to balance the see-saw?
Friday, January 30, 2015 at 11:25pm

Physics
An object in space is initially stationary relative to the Earth. Then, a force begins acting on the object, starting with a force of 0 N, and increasing at a uniform rate until the magnitude of the force is 56 N after the force has acted for 10 s. The body has a mass of 15 kg...
Friday, January 30, 2015 at 5:51pm

Physics
A cheetah is hunting. Its prey runs for 2.88 s at a constant velocity of +8.93 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time? (Give the magnitude of the acceleration
Friday, January 30, 2015 at 5:30pm

Physics
A Boeing 747 "Jumbo Jet" has a length of 55.9 m. The runway on which the plane lands intersects another runway. The width of the intersection is 24.0 m. The plane decelerates through the intersection at a rate of 5.61 m/s2 and clears it with a final speed of 43.3 m/s...
Friday, January 30, 2015 at 5:30pm

Physics
A bullet is fired through a wooden board with a thickness of 12.0 cm. The bullet hits the board perpendicular to it, and with a speed of +370 m/s. The bullet then emerges on the other side of the board with a speed of +333 m/s. Assuming constant acceleration (rather, ...
Friday, January 30, 2015 at 5:28pm

physics
A ball is dropped from an upper floor, some unknown distance above your apartment. As you look out of your window, which is 1.5 m tall, you observe that it takes the ball 0.18 seconds to traverse the length of the window. Determine how high above the top of your window the ...
Friday, January 30, 2015 at 4:21pm

physics
a) Determine the capacitance, in pF, of a paper-filled parallel-plate capacitor (dielectric constant=3.70) having a plate area of 5.40cm2 and plate separation of 590 µm. Use 8.85 x 10-12 F/m for εo, the permittivity of free space. For this I got 2998.53x10-2 b) ...
Friday, January 30, 2015 at 2:27pm

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