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Question1
Find out the coefficient of kinetic friction between a 3.15 kg block and horizontal surface on which it rests if an 82.0 N/m spring must be stretched by 5.90 cm to pull it with constant speed. Suppose that the spring pulls in the horizontal direction.
Question2
A girl on a sled coasts down a hill. Her speed is 7.8 m/s when she reaches level ground at the bottom. Coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.047, and the girl and sled together weigh 635 N. How far does sled travel on level ground before coming to rest?
Question3
A net torque of magnitude 500 Nm is exerted on the rotor of an electric generator for 29 s.
What is magnitude of the angular momentum of the rotor at the end of 29 s if it was initially at rest?
Answer in units of kgm2/s
You stand with your nose 5.0cm from the surface of a reflecting ball, and your nose's image appears three-quarters full size. What is the balls diameter?
A 1.90 kg ball is attached to the bottom end of a length of fishline with a breaking strength of 10 lb (44.5 N). At what angle (measured from the vertical) will the fishline break
A baseball pitcher throws a fastball at a speed of 35m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it throughout an almost straight-line distance of 3.7 m. estimate the acceleration, assuming that it is constant ..
A uniform pole is propped between the floor and the ceiling of a room. The height of the room is 8.00 ft, and the coefficient of static friction between the pole and the ceiling is 0.569. What is the length of the longest pole
A 1.5V battery has an internal resistance of .5 Ohm. If a light bulb with cold resistance of 10 Ohm is placed in a series with the battery, how much current initially flows in the circuit
A sample of paramagnetic material containing \(10^{25}\) atoms is placed in an external field magnetic field of 1 tesla at room temperature
A tennis ball of mass 0.0611 kg is served. It strikes the ground with a velocity of 55.6 m/s (124 mi/h) at an angle of 21.2° below the horizontal. what average force did the ground exert on the ball
A spelunker is surveying a cave. He follows a passage that goes 181 m straight west, Use a scale drawing to determine the fourth displacement
Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. If the laser light wavelength is 1062 nm, How many wavelengths are found within the laser pulse
A popular amusement park ride looks like a huge cylinder of radius 2.3 m, where people stand up along the vertical walls on top of a floor which can drop away. find the minimum rotations per second the cylinder must make
A heat engine using a diatomic ideal gas goes through the following closed cycle, What is the thermal efficiency of this heat engine
An 85 kg man lowers himself to the ground from a height of 5.6 m by holding onto a rope that runs over a frictionless pulley to a 75 kg sandbag
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