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Q. If the coefficient of kinetic friction between a 33 kg crate and the floor is 0.26, what horizontal force is required to move the crate at a steady speed across the floor? Which is 84 I just help with the last part
What horizontal force is required if µk is zero?
Q. A girl on a sled coasts down a hill. Her speed is 7.0 m/s when she reaches level ground at the bottom. The coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.040, and the girl and sled together weigh 644 N. How far does the sled travel on the level ground before coming to rest?
Volcanoes on the Earth eject rocks at speeds of up to 160 m/s. Consider a 1260 m high volcano that ejects rocks in all directions. What is the maximum height above sea level reached through rocks.
The acceleration due to gravity on the surface of the moon is about g/ 6. If a pendulum has a period T on earth what will its period be on the moon?
How to compute for the density of dark matter estimate mass density of dark matter in the solar neighbourhood. Express the answer in units of kg m-3, Msun pc-3, Msun AU-3.
The cockroach finds a bread crumb on the rim and, of course, stops. What is an angular speed of the lazy Susan after the cockroach stops.
A mass m = 90 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 18.8 m and finally the flat straight section at the same height as the center of the loop (18.8 m off the ground). Because the mass would not..
Two cars are traveling along a straight road. Car A maintains a constant velocity of 110 km/h and car B maintains a constant speed of 110 km/h. At t= 0, car B is 45 km behind car A. How far would car A travel from t = 0, before it is overtaken by c..
A copper telephone wire has essentially no sag between poles 20.5 meters apart on a winter day while the temperature is -15.5° C. How much longer is the wire on the summer day when the temperature is 27.0° C.
A 4m length of light nylon cord is wound around a uniform cylindrical spool of radius 0.50 m and mass 1 kg. The spool is mounted on a frictionless axle and is initially at rest. The cord is pulled from spool with a constant acceleration of magnitu..
Two narrow slits 50 micrometers apart are illuminated with light of wavelength 500 nm . What is an angle of the m=2 bright fringe in radians? in degrees.
You and the friend each drive 47.0 km. You travel at 87.0 km/h; your friend travels at 98 km/h. How long will your friend wait for you at the end of trip.
In the meantime, the velocity of airplane Q relative to the air is 250 m/s in the direction of N 20o W. What is the speed of airplane Q relative to the airplane P.
A 0.50-kg object is attached to an ideal massless spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.7 m/s at the equilibrium position.
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