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- A 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00 m down the incline in 1.50 s. Find (a) the magnitude of the acceleration of the block, (b) the coefficient of kinetic friction between block and plane, (c) the friction force acting on the block, and (d) the speed of the block after it has slid 2.00 m.In Example 4.6, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.800 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.50 s and comes to rest. What does the spring scale register (a) before the elevator starts to move, (b) during the first 0.800 s, (c) while the elevator is traveling at constant speed, and (d) during the time interval it is slowing down?Can a body have a constant speed but a varying velocity?
- Can A Body Have A Constant Speed And Still Have A Varying Velocity?What is a practical example of how a body can still accelerate even without changing its speed?Can you give a practical example of how a body can still accelerate even without changing its speed? If you can, give me an example and an explanation of it
- A pilot performs an evasive maneuver by diving vertically at 290 m/s. If he can withstand an acceleration of 8.0 g's without blacking out, at what altitude must he begin to pull out of the dive to avoid crashing into the sea? Express your answer to two significant figures and include the appropriate units.A block of mass m=7 kg on a rough plane is attached by a cord passes over a smooth pulley to m=5 kg. The kinetic force of friction = 2N and the system is released from rest. Find the acceleration of the system (in m/s?). (Use: g=10 m/s)What can we say about the motion of a freely falling body? A. It is uniformly accelerated. B. It is uniform. C. It will always reach terminal velocity. D. Its acceleration results from gravity and air resistance.
- A block is given a brief push so that it slides up a ramp. After the block reaches its highest point, it slides back down, but the magnitude of its acceleration is less on the descent than on the ascent. Why?Can A Body Have Zero Velocity And Still Be Accelerating?A pilot performs an evasive maneuver by diving vertically at 310 m/s. If he can withstand an acceleration of 8.0 g without blacking out at what altitude must he begin to pull out of the dive to avoid crashing into the sea? Express your answer using two significant figures and include the appropriate units.