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A piece of metal wieghs 50.0 N in air, 36.0 N in water, and 41.0 N in an unknown liquid. Find the densities of the matal and the unknown liquid
A 200 kg weather rocket is loaded with 100 {rm kg} of fuel and fired straight up. It accelerates upward at 31 m/s^2 for 33 s, then runs out of fuel. Ignore any air resistance effects. How long is th
The battery has internal resistance of 0.100 Ω, and the rod and rails have negligible resistance. A 2.02 T magnetic field is directed perpendicular to the plane of the circuit. (a) Find the ma
A flywheel with a very low friction bearing takes 1.9 h to stop after the motor power is turned off. The flywheel was originally rotating at 34 rpm. What was the initial rotation rate in radians per
A tennis player receives a volley with the ball (0.0600 kg) traveling horizontally at 51.0 m/s and returns the ball so that it travels horizontally at 42.0 m/s in the opposite direction. What is th
When they are relaeased from rest will they start to move? If so determine their acceleraton and the tension in the string. If not determine the sum of the magnitudes of the forces of friction actin
A hot iron horseshoe (mass=0.40 kg), just forged is dropped into 1.35 L of water in a 0.30-kg iron pot initially at 20 degree celsius. If the final equilibrium temperature is 25.0 degree cesius, es
A 73.0 kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.90 m/s in 1.50 s. It travels with this constant speed for the next 5
A 22 diameter bowling ball has a terminal speed of 77 m/s}. What is the ball's mass?
Calculate the horizontal force that must be applied to produce and acceleration of 1g for 1kg puck on a horizontal friction air table.
A bungee jumper undergoes simple harmonic motion with amplitude 4.8m and frequency .105Hz. Assume the bungee jumper follows the simple harmonic motion equation x=Acos(wt) determine the bungee jumpe
A mass m1 = 13.5 kg and a mass m2 = 11.0 kg are suspended by a pulley that has a radius of 9.8 cm and a mass of 3.2 kg (see figure). The cord has a negligible mass and causes the pulley to rotate wi
Calculate the time t for the pencil to hit the ground, assuming that it falls from standing perfectly vertical and maintains this angular acceleration.
The person and canoe have a combined mass of 100 kg. Ignore air resistance and effects of the water and find the horizontal recoil velocity (magnitude and direction) of the person and canoe.
A 79 kg pole-vaulter falls from rest from a height of 7.2 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.48 s after landing on the pad. Calculate the athlete's velocity just before reach
What is the apparent weight of a 75 kg astronaut 4200km from the center of the earths moon in a space vehicle (a) moving at constant velocity and (b) accelerating toward the moon at 2.9m/ssw
A 140g air-track glider is attached to a spring. The glider is pushed in 12.0cm and released. A student with a stopwatch finds that 9.00 oscillations take 10.0s. What is the spring constant?
A 2200-kg pile driver is used to drive a steel beam into the ground. The pile driver falls 7.00 m before coming into contact with the top of the beam, and it drives the beam 14.0 cm farther into the
What is the angular speed of rotation of the Earth? (2) An old 33 1/3 rpm record player starts from rest and reaches operating speed in 2.00 seconds. Through what angle did it turn in those 2.00 se
Derive an equation for the radius r of the circular path that the electrons follow in terms of the magnetic field B, the electrons' velocity v, charge e, and mass m. You may assume that the electro
A weight lifter lifts a set of weights a vertical distance of 1.56m. If A constant net force of 379N Is exerted on the weights, what's the net work done on the weights?
An aluminum rod is 18.5 cm long at 20 degrees celcius and has a mass of 350g. If 10,000J of energy is added to the rod by heat, what is the change in length of the rod?
If the blocks move determine the magnitude of the tension in the string. If the blocks do not move determine the sum of the magnitude of the forces of friction acting on the blocks. Show all work.
If we place the origin in the nest and extend the +x-axis to the release point, what was the bird's average velocity for the return flight? (m/s). What was the bird's average velocity in {rm m/s} fo
Three uniform thin rods, each of length L = 35 cm, form an inverted U. The vertical rods each have a mass of 18 g; the horizontal rod has a mass of 35 g. What are (a) the x coordinate and (b) the y