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In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a velocity of +4.0 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +2.9 m/s. The mass of the tackler is 100 kg. Assuming that momentum is conserved, find the mass of the receiver.
A small sphere with a charge of -5.9 10-7 C is placed in a uniform electric field of magnitude 1.9 106 N/C pointing to the west. What is the magnitude and direction of the force on the sphere due to the electric field?
A research submarine has a 40.0cm -diameter window 8.30cm thick. The manufacturer says the window can withstand forces up to 1.10×106N
A uniform solid disk with a mass of 28.3 kg and a radius of 0.514 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as drawing illustrates.
A spring with 58 hangs vertically next to a ruler. The end of the spring is next to the 11- mark on the ruler. If a 2.5- mass is now attached to the end of the spring, illustrate where will the end of the spring line up with the ruler marks?
A school yard teeter-totter with a total length of 5.2m and a mass of 36kg is pivoted at its center. A 19 kg child sits on one end of the teeter-totter.
The mass of a newborn baby's brain has been found to increase by about 1.6 mg per minute. How much does the brain's mass increase in one day? How long does it take for the brain's mass to increase by 0.0045 kg ?
A 145 g wire is held under a tension of 258 N with one end at x = 0 and the other at x = 13.0 m. At time t = 0, pulse 1 is sent along the wire from the end at x = 13.0 m. At time t = 30.9 ms, pulse 2 is sent along the wire from the end at x = 0. A..
Find time constant if the ball's amplitude has decreased to 2.20 cm after 51.0 oscillations? Explain your answer.
When the air temperature is below 0, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.60 cm thick is at -10.30 Celsius and the bottom surface is at 0.00 Celsius, compute the time it will ta..
A 1.5kg- block of ice is initially at a temperature of -7.0C a)If 2.6×10^5J of heat are added to the ice, what is the final temperature of the system? b)Find the amount of ice, if any, that remains.
You have a 56.9-mF capacitor initially charged to a potential difference of 10.1 V. You discharge the capacitor through a 4.77-Ω resistor. What is the time constant? After what multiple of the time constant does the potential difference reach 2.47 V.
A father (m = 65 kg) and son (m = 38 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3.0 m/s after they have separated. How fast would the father be moving.
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