Someone holds the block on the table at rest. Once he releases the block, the block may accelerate or not. In either case, calculate the acceleration in m/s². These are the numbers: • m = 0.4 kg • M = 0.2 kg . μs-0.4 . μk -0.2 m M

A ball with mass 0.75 kg is thrown upward with initial velocity 25 m/s from the roof of a building 20 m high. Assume there is a force due to |v| air resistance of magnitude directed opposite to the velocity, where 30 the velocity v is measured in m/s. NOTE: Use g=9.8 m/s² as the acceleration due to gravity. Round your answers to 2 decimal places. a) Find the maximum height above the ground that the ball reaches. Height: 51.89 m Time: 5.81 X b) Find the time that the ball hits the ground. seconds X c) Use a graphing utility to plot the graphs of velocity and position versus time. Edit

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A physics student, in a stationary elevator, places a 240.0 g mass on an electronic balance. The student hits the elevator button and it begins to move upwards. While the elevator is moving, the student records this information Time = 0 to 3.0 sec the balance reads 278 grams Time = 3.0 - 12 sec the balance reads 240. grams Time = 12.0 to 15.0 sec the balance reads 192 gram How far up (in meters) did the elevator travel? Consider: UP to be (+), DOWN to be (-) and g =9.8 m/s2 .  ROUND YOUR ANSWER TO A WHOLE NUMBER of meters (no decimal places) HINT: This problem requires finding THREE different displacements and adding them up! 2nd HINT:  You will need to (A) use your equations of motion or (B) make a v-t graph to find those displacements!

Jennifer is walking at 1.22 m/s. If Jennifer weighs 552 N, what is the magnitude of hermomentum?A) 97.0 kg  m/sB) 137 kg  m/sC) 68.6 kg  m/sD) 672 kg  m/sE) 951 kg  m/s

Answer to 5)1.96

You want the final speed at the bottom of your roller coaster hill to be 25 m/s. What is the height (h) of the hill to achieve this?  Use g = 9.8 m/s2

For a short period of time, the frictional driving force acting on the wheels of the 2.3-Mg van is FD = (600+2) N, where t is in seconds. (Figure 1) Figure FD 1 of 1 Part A If the van has a speed of 22 km/h when t= 0, determine its speed when t = 5 s. Express your answer to three significant figures and include the appropriate units. CHμA V = 3.32 Submit m Provide Feedback S ? Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining

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