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The angle through which a rotating wheel has turned in time (t) is given by theta=8.5t-15.0t^2+1.6t^4 where theta is in radians and (t) is in seconds. Determine an expression: for instantaneous angu
What will the attractive force be if the vacuum is replaced with water at 20o C? The permittivity of water at this temperature is 7.07x10-10 C2/N-m2.
If m1 is 3.7 kg and m2 is 9.1 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor?
Two identical particles have equal but opposite momenta, p and -p, but they are not traveling along the same line. Show that the total angular mass of this system does not depend on the choice of o
A canoe has a velocity of 0.380 m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.520 m/s east relative to the earth. Find the magnitude of the velocity V c/r of the
The target is approaching at a speed of 15 m/s. At what horizontal distance between the target and the rocket should you launch?
When a system is taken from state to state in the figure along the path acb, the amount of heat that flow into the system is 91.0 J and the work done by the system is 61.0 J. How much heat flows int
Find (a) the magnitude of the tension in the wire and the magnitudes of the (b) horizontal and (c) vertical components of the force that the wall exerts on the left end of the beam.
A 4.00 m length of light nylon cord is wound around a uniform cylindrical spool of radius 0.500 m and mass 1.00 kg. The spool is mounted on a frictionless axle and is initially at rest. The cord is
What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor?
during a game of soccer, the .425 g ball is kicked from rest to 26 m/s in 8 s. calculate the impulse to the ball and its change in momentum.
Calculate the magnetic field at the origin due to the proton and the alpha particle. your answer must be a vector. show all steps in your work.
Assume that the springs have somehow not yet compressed to their maximum amount. How much are the springs compressed? The spring constant is 2.9×10^4
What is the net charge on the electroscope? Wouldn't the electrons from the earth be attracted to the positive charge?
A magnifying glass has a converging lens of focal length of 18.8 cm. At what distance from a nickel should you hold this lens to get an image with a magnification of +2.47?
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 34.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration
A group of swimmers is resting in the sun on an off-shore raft. They estimate that 4.8 m separates a trough and an adjacent crest of surface waves on the lake. They count 16 crests that pass by the
A cord is wrapped around a pulley of mass m and radius r. Use energy methods to show that the block's speed as a function of position d down the incline is
A projectile is fired horizontally from a gun that is 59.0 m above flat ground, emerging from the gun with a speed of 473 m/s. (a) How long does the projectile remain in the air? (b) At what horizo
Bonnie and Clyde are sliding a 317 kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 369 N of force while Bonnie pulls forwa
Francesca dangles her watch from a thin piece of string while the jetliner she is in accelerates for takeoff, which takes about 14 s. Estimate the takeoff speed of the aircraft if the string makes an
A) proton has an initial speed of 3.96 E 5 m/s. What potential difference is required to bring the proton to rest?
Mr. Physics drops a rock down a 250-meter deep well. Upon impact with the bottom of the well a short burst of sound is produced with a frequency of 250 Hz. How long after he drops the rock does he h
Identify the action-reaction pairs when a baseball is being hit.
find the magnitude of the tension in the wire and the magnitudes of the (b) horizontal and (c) vertical components of the force that the wall exerts on the left end of the beam.