d. ma 350 5m 2. A runner weighs 500 N. Initially his speed is 5 m/s. a. If he does 30 J of work, what is his final speed? b. By how much would the runner accelerate in 7 seconds? c. How much is the power produced by his work?

A hand pushes a 3 kg block along a table from point A to point C as shown in the figure below. The table has been prepared so that the left half of the table (from A to B) is frictionless. The right half (from B to C) has a non-zero coefficient of friction equal to µ. The hand pushes the block the full distance from A to C using a constant force of 5 N. The block starts off at rest at point A and comes to a stop when it reaches point C. The distance from A to B is 0.5 m and the distance from B to C is also 0.5 m. We will consider the block by itself as our system so all forces on the block are external. Initial position of block Final position ofblock P no friction friction A B C -1½ m 1½ m

A man pulls a 25 kg box in a horizontal fashion with 60N of force over a surface with us = 0.15 and uk = 0.05. a. After pushing it for 10m, how much thermal energy is produced? b. What is the net work done on the system? Draw a FBD.

9. Consider a 59kg volleyball player who is jumping to spike the ball. Her 0 position is the bottom of the squat. At take-off, she has 320 J of kinetic energy and 580 J of potential energy. a. How high is her COM at takeoff? b. How fast is she going when she takes off? c. What will the height of her COM be at the highest point of the jump?

A machine has a power rating of 300 watts. It worked for 4.0 seconds. How much work was done? A. 75 J B. 1200 J C. 304 J

You lift a box off the ground and then hold it at a height above your waist. Which does not describe the work or energy in this process? A. You did positive work on the box. B. Gravity did negative work on the box C. The box's gravitational potential energy increased. D. The box's kinetic energy remained constant throughout the process.

I need help with 2a and 2b

Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 seconds. What is the power output by the elevator?  a. 20 W b. 50 W c. 100 W d. 1000 W e. 20,000 W

For locations that have no electric service, companies are designing bicycle-powered generators that are nearly 100% efficient that can be used to charge cell phones or power lights. If you are the person chosen to pedal and your friends need a total of 150 W of electric power, how much metabolic powerwill you use as you pedal?A. 150 W                    B. 300 W                        C. 450 W            D. 600 W

19. Using a rope, you pull a large 150 kg sled while accelerating at 0.2 m/s² across a horizontal (level) but icy surface. For a coefficient of kinetic friction between the sled an ice is 0.1. Calculate the total work when pulling the sled, a distance of 10 m. a. b. 30 Joules 300 Joules C. 1500 Joules d. 1800 Joules e. None of these are correct