How many workouts per week of vigorous, continuous activity are needed to improve your cardiorespitory fitness? A. 2-3 B. 3-5 C. 4-5 D. 5-6

Which of these is an example of a chemical change? Question 4 options: fireworks exploding grinding powder melting cheese ironing a shirt

Explain the theory Steven Reiss developed and tested.

calculate the following round off to the correct number of significant figures and express your result in scientific notation. A). (200.9) (569.3) B.) (0.000000513) (62.3x10^7)

Two blocks with masses m1=0.25kg and m2=1.4kg approach each other along a horizontal, frictionless track. The initial velocities of the blocks are v1=1.20 m/s to the right and v2=0.34 m/s to the left.

2) what happens when a force acts upon an object?

Why does a metal spoon left on a bowl of hot soup become warm? A) Metal is a conductor. B) Metal is an insulator. C) Metal produces its own heat. D) Metal heats up from magnetism.

What does the heat shock step of the transformation procedure accomplish?

An olympic hurdler accelerates at a rate of 15.5 m/s2. what is the rate in miles/min2?

What is the conservation of energy?

What data are needed to calculate the actual mechanical advantage of a machine