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A 63.0 kg girl weighs herself by standing on a scale in an elevator. What is the force exerted by the scale when the elevator is descending at a constant speed of 10 m/s?
A rotating cylinder about 16 {rm km} long and 6.8 km in diameter is designed to be used as a space colony.With what angular speed must it rotate so that the residents on it will experience the same
Assume that the spring has negligible mass and that all its stored energy is transferred to the particles. Once that transfer is complete, what are the kinetic energies of (a) parttcle A and (b) par
Gillian buys a pendulum clock at a discount store and discovers when she gets it home that it loses 6.00 minutes each day.
A fully loaded Volvo station wagon has a mass of 2000 kg. If each of its four tires is inflated to a gauge pressure of 215 kPa, what is the total tire area in contact with the road?
Find the intensity of the sound waves produced by one 60- speaker at a distance of 1.5.
A small ball of mass 81 g is suspended from a string of length 26 cm and whirled in a circle lying in the horizontal plane. If the string makes an angle of 23? with the vertical, find the centripet
A 8 m long string, clamped at both ends, vibrates at 52 Hz. If the string resonates in 6 segments, what is the speed of transverse waves on the string?
Two sound sources radiating in phase at a frequency of 560 Hz interfere such that maxima are heard at angles of 0 and 25° from a line perpendicular to that joining the two sources. Find the sep
Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net external force of 320 N to the right. If they pull in opposite directions, the raft e
A thermos contains 125 cm3 of coffee at 85° C. To cool the coffee, you drop two 13-g ice cubes into the thermos. The ice cubes are initially at 0° C and melt completely. What is the final t
A wire .250 m long in a .750 A in a region of uniform magnetic field. The wire is subject to force of 2.50 N when held perpendicular to the direction of the field. What is the magnetude of the magn
During a workout, football players ran up the stadium stairs in 85 . The stairs are 88 long and inclined at an angle of 27. If a player has a mass of 92 , estimate his average power output on the w
A boy makes a pinhole camera out of a cardboard box with the dimensions 10.0 cm x 10.0 cm x 16.0 cm. A pinhole is located in one end, and a film 8.0 cm x 8.0 cm is placed in the other end. How far
If a particular car covers the ?rst half of the track at an average speed of 213 km/h, what minimum average speed must it have in the second half of the event in order to qualify?
A 5.70 g bullet moving at 551 m/s strikes a 730 g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 499 m/s. (a) What is
A wheel of diameter of 68.0 cm slows down uniformly from 8.40 m/s to rest over a distance of 115 m. What is the total number of revolutions the wheel rotates in coming to rest?
A hot ( ) lump of metal has a mass of 250 g and a specific heat of 0.25 . John drops the metal into a 500-g calorimeter containing 75 g of water at . The calorimeter is constructed of a material th
As a multiple of Earth's radius RE, what is the radial distance a projectile reaches if its initial speed is two-fifths of the escape speed from Earth?
A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of its swing?
What is the equation for maximum height of a bottle rocket, ignoring air resistance.
What is the maximum height attained by the rocket? What is the speed of the rocket just before it hits the ground? C) What is the total duration of the rocket's flight?
A 60.5-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.40 m. What is the work done
On a highway curve with radius 50m. What speed limit should be posted for the curve so that cars can negotiate it safely.
A tuner first tunes the A string very precisely by matching it to a 440 Hz tuning fork. She then strikes the A and E strings simultaneously and listens for beats between the harmonics. What beat fre