18. A boy 60 kg hops with a horizontal velocity of 5 ms on a stationary skateboard. The skateboard weighs 4 kg. Find out the velocity when the board starts rolling? The condition given here is that any external unbalanced force is absent.
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- Question 8Greg Huegel, a Clemson All-American placekicker and former PHYS 2070 student, was nicknamed “The Grocery Store Kicker” by Dabo Swinney after being discovered as a walk on. When kicking a football, the kicker rotates his leg about the hip joint. As we proceed through this question, you will have to pull on information from past tests. If the velocity of the tip of the kicker’s shoe is 33.5 m/s and the hip joint is 1.25 m from the tip of the shoe, what is the shoe tip’s angular velocity in rad/s? The shoe is in contact with the initially nearly stationary 0.500 kg football for 20.0 ms. What average force is exerted on the football in Newtons to give it a velocity of 20.5 m/s? find the maximum range of the football in meters, neglecting air resistance.Understanding the details of timing and forces in motion can improve the performance of athletes, including dancers. Consider the forces involved in a ballet jump called a sauté demi plié. P9.84a shows the sequence of moves in the jump. The dancer starts upright, then quickly bends her knees, moving downward. After she reaches the bottom of this dip, she extends her legs, pushing herself upward. After this upward push, she leaves the ground, beginning a short period of time in the air. P9.84b is a slightly idealized graph of the net force on a 42 kg dancer executing this move. The sauté demi plié begins with a phase in which the net force on the dancer is negative. During this phase of the jump,A. The normal force of the floor on her is zero.B. The normal force of the floor on her is less than her weight but greater than zero.C. The normal force of the floor on her is equal to her weight.D. The normal force of the floor on her is greater than her weight.
- A steel beam is rotating in a horizontal plane to provide the centripetal acceleration for training pilots. The pilot sits 2.81 m from the center of rotation. If the pilot experiences 3.49E3N of force as he revolves with tangible velocity of 10.6 m/s, what is the pilots mass?E15. Two 0.2-kg masses are located at either end of a 1-m long, very light and rigid rod as in the diagram. What is the rota- tional inertia of this system about an axis through the center of the rod?In the figure below, block 2 of mass m2 = 3.75 kg rests on a frictionless surface. It is attached to mass 1 (m1 = 2.50 kg) by a massless, stretchless string that passes over a frictionless pulley of radius R = 15.0 cm. When released from rest, block 2 moves to the right with an acceleration of 3.80 m/s2. What is the mass of the pulley? must draw FBDs
- If an astronaut on the International Space Station accidentally left a wrench in space, the wrench would burn up as it re-entered the Earth's atmosphere, long before it hit the Earth. This question is about what would happen before that. Figure 1 Before After A wrench with a mass of 0.29 kg began at rest at a distance of d1 = 4.12 x 10° meters from the center of the Earth. The wrench then began falling toward Earth. Sometime later, the wrench was at a distance of d2 = 3.98 x 10° meters from the center of the Earth. Assume that the only significant force acting on the wrench was the gravitational force exerted by the Earth. The mass of the Earth is 5.97 x 1024 kg. Newton's gravitational constant is G = 6.67 x 1011 m³/(kg s²) (the denominator is kilograms to the first power times seconds squared) Calculate the speed of the wrench in units of meters per second when it is at a distance d2 from the center of the Earth.A 1.5 kg block is connected by a rope across a 50-cm-diameter, 2.0 kg pulley, as shown. There is no friction in the axle, but there is friction between the rope and the pulley; the rope doesn’t slip. The weight is accelerating upward at 1.2 m/s2. What is the tension in the rope on the right side of the pulley?A man stands on a merry-go-round that is rotating at 2.13 rad/s. If the coefficient of static friction between the man's shoes and the merry-go-round is ?s = 0.63, how far from the axis of rotation can he stand without sliding? (Enter the maximum distance in meters.) m
- Two equal 16.5 kg masses are at the ends of a 4.6 kg 60.5 cm rod that is initially spinning about the rods center at 55.7 rev./sec. suddenly the rods length is increased to 92.3 cm. How fast is the rod (& masses) spinning now? Neglect any frictional interactions in the axle. Enter in your in rev./sec.How would I find magnitude of accelerationPlease help: A 2.90 kg bucket is attached to a disk-shaped pulley of radius 0.131 m and mass 0.792 kg. If the bucket is allowed to fall, How far does the bucket drop in 1.20 s?