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A small ball of mass 42 g is suspended from a string of length 69 cm and whirled in a circle lying in the horizontal plane.If the string makes an angle of 28 with the vertical, find the centripetal
An aluminum bar 125 mm long and having a square cross section 16.5 mm on an edge is pulled in tension with a load of 66,700 N, and experiences an elongation of 0.43 mm. Assuming that the deformatio
How much energy is released when 0.0254-m (one inch) of water falls over an area of 2.59 X 10^6 m^2 (one square mile)?
A 3.50-m-long, 360 steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 construction worker stands at the far end of
An object weighs 317 N in air. When tied to a string, connected to a balance, and immersed in water, it weighs 264 N. When it is immersed in oil, it weighs 268 N. Find the density of the object. Ans
If 2.0% of this energy could be converted by a weight lifters body into work done in lifting a barbell, what is the heaviest barbell that could be lifted a distance of 2.1-m?
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