100kg quarterback is travelling at 3m/s and is stopped by a tackler in 2s.

a. calculate the average force exerted by the tackler?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

You wish to use phasor notation to convert V 100 cos (100t 30°) 5 sin (100t - 40) into a single sinusoidal function. Which of the following functions are equivalent to the phasor form of V? a. 95.3228.97 1002300+52 (-130°) b. 83.

Which of the following happens when a solid changes to a liquid? a. Energy flows from the liquid to its surroundings b. Particles in the solid move from their fixed position and become less orderly c. The solid particles lose energy d.

Which of the following is NOT a property of long-period comets that suggests that they originate from the Oort cloud? a. Many of them have large inclinations relative to the ecliptic plane. b.

A car travelling at 40 m/s comes to a halt in 8 seconds. What is the car's acceleration and how far does it travel while it is stopping?

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines