Which of the following objects has the greatest kinetic energy

A-a baseball flying through the air at 90 mph

B - a baseball flying through the air at 45 mph

C - a baseball flying through the air at 20 mph

D-a baseball sitting on the ground

A 19-year old soccer player extends their right knee from an initial angle of 20o to 140o in 2 s. If this movement began from rest, what was the angualr acceleration? Hint: convert angular displacement to radians (1 revolution = 360o = 2π radians).

If a pulley system with an actual mechanical advantage of 2,000,000 is used in lifting a 2,000 lb. car, what effort would be needed to move the car?

Each of the following elements is magnetic except A. aluminum B. cobalt C. nickel D. iron

A superball of mass m is dropped vertically from a height, h. if the impact time with the floor is t, what is the average force on the ball

A swimmer can swim in still water at a speed of 9.50 m/s. he intends to swim directly across the river that has a downstream current of 3.75 m/s. what is his velocity relative to the bank?

Identify characteristics of objective personality tests. -self-report -scientific -paper-and-pencil -questions about behavior -objective -potentially biased answers Multiple Choice-Psychology

The Pony Express was a mail delivery system in the Old West that used a series of men on horseback to deliver mail from St. Joseph, MO to Sacramento, CA along a trail that was 2000 miles long.

In the virtual lab, calculations were made of the predicted diffraction angle, using the formula θ ≈ StartFraction lambda over L EndFraction.

What trends were seen in Mendeleev's periodic table?

Through which medium would EM waves travel the fastest? A. The Ocean B. The Atmosphere C. Rocks