You are standing on a bathroom scale in an elevator in a tall building. Your mass is 64 kg. The elevator starts from rest and travels upward with a speed that varies with time according to v(t) = (3.0 m/s2)t + (0.20 m/s3)t2. When t = 4.0 s, what is the reading on the bathroom scale?
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You are standing on a bathroom scale in an elevator
in a tall building. Your mass is 64 kg. The elevator starts from
rest and travels upward with a speed that varies with time according to
v(t) = (3.0 m/s2)t + (0.20 m/s3)t2. When t = 4.0 s, what is the reading
on the bathroom scale?
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- The figure below is for a 7 kg box on a horizontal floor. Initially, you are pushing horizontally on the box and friction is opposing you. Then, you stop pushing the box. Use g = 10 m/s2. v(m/s) 6.0 4.5 3.0 1.5 0.3 0.6 0.9 t(s) Find the gravitational force acting on the box. Find the normal force acting on the box. Assume the frictional force is constant throughout the motion and find the frictional force. Assume the frictional force is constant throughout the motion and find your pushing force. Find the displacement of the box over the entire time shown.The acceleration of a particle moving along the = -7 t + 4 t* + 3 t2, 7. x-axis is given by the function where a is in meters per second squared and t in seconds. What is the particle's velocity at t = 2 s if the object's mass is 11.3 kg and has an initial velocity of 1.6 m/s?A 1250 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional force fk between boat and water is proportional to the speed v of the boat. Thus, fk = 80v, where v is in meters per second and fk (the magnitude of the frictional force) is in newtons. Find the time required for the boat to slow down to 45 km/h.
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