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The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and exerting a radially inward force of 68 N. Find the effective coefficient of kinetic friction between the wheel and th
What is the magnitude of the impulse delivered to the ball?
A 40 kg child is in a swing that is attached to a rope 2m long. Find potential energy associated with the child relative to his lowest point when the ropes are horizontal.
Children in a tree house lift a small dog in a basket 3.50 m up to their house. If it takes 219 J of work to do this, what is the combined mass of the dog and basket?
A 100-m-long train accelerates uniformly from rest. If the front of the train passes a railway worker 166 m down the track at a speed of 21 m/s, what will be the speed of the last car as it passes t
Where is the center of mass of the system formed by these four objects?
A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.6 kg mass (m2) that hangs over the side of the shelf 1.6 m above the ground.
A 1405-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 12.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision?
A 44 resistor can dissipate up to 0.26 W of power without burning up. What is the smallest number of such resistors that can be connected in series across a 9.0 V battery without any one of them bur
A particle moving in simple harmonic motion passes through the equilibrium point (x = 0) 6 times per second. At t = 0 its velocity at x = -0.08125 m is negative. It travels 0.65 m in a complete cyc
The object when it is submerged will cause systematic errors. will this error give an experimental density that is too high or too low? explain
An atwood machine consist of two unequal masses connected by a cord that passes over a pully. If m1=6.0 kg and m2=5.0 kg, what is the acceleration of the masses? (assume the pulley and cord are fric
The third floor of a house is 7.0 m above street level. How much work is needed to move a 120-kg refrigerator to the third floor?
If the speed of sound in the body is the same as in salt water, 1.45 km/s, what is the length of a 4.40-MHz pressure wave in the body?
A 1.87 m tall basketball player wants to make a goal from 10.6 m from the basket. If he shoots the ball at a 42.5 angle, at what initial speed must he throw the basketball so that it goes through t
A bat flies toward a wall, emitting a steady sound of frequency 2.00 rm kHz. This bat hears its own sound plus the sound reflected by the wall. How fast should the bat fly in order to hear a beat fr
The ground during the motion and is observed to stretch by 0.011 m. By how much would the spring stretch if it were attached to the ceiling and the ball allowed to hang straight down, motionless?
Consider the act of shooting an arrow with a bow. As you set the arrow in place, you pull straight back on the bow a distance of 0.35 m. Releasing it from rest, the arrow is uniformly accelerated by
Is the kinetic energy conserved for the system? Determine the ratio of the final kinetic energy to initial kinetic energy.
The hare waits for a while after the tortoise passes and then runs toward the finish line again at 8.50 m/s. Both the hare and the tortoise cross the finish line at the exact same instant. Assume bo
Assume that light is a classical wave and that the light striking the disk is completely absorbed. How does your estimate compare with the observation that photoelectrons are emitted within 10-9s?
A 1000 kg cart is rolling to the right at 5.0 m/s. A 75 kg man is standing on the right end of the cart. What is the speed of the cart if the man suddenly starts running to the left with a speed of
A particle moves along the x axis. It is initially at the position 0.200 m, moving with velocity 0.160 m/s and acceleration -0.370 m/s2. Suppose it moves with constant acceleration for 5.50 s. (a) F
(a) Determine the magnitude and direction of the current in the lower wire. (b) Is the lower wire in stable equilibrium? (c) Repeat parts (a) and (b) if the second wire is suspended 5.0 cm above the
Two protons are moving directly toward one other with the same velocity. When they are far apart, their initial speeds are 1:2 105 ms.