How much physical activity do children and trens need?

A. 50 minutes at least twice a week

B. 50 minutes at least five days a week

C. 150 minutes a week

D 150 minutes at least five days a week

Potential energy can transform into kinetic energy and vice versa so the total energy stay the same (reflect on the skateboard simulation) A) True B) False

What would happen to the velocity of a wave if the frequency is increased and the wave length remains the same

A ball is thrown directly downward with an initial speed of 8.50 m/s, from a height of 29.7 m. After what time interval does it strike the ground?

Which situations describe an elastic collision? a.) Two glass marbles bounce off each other. b.) Rodrick flops onto his sofa and sinks into the cushion. c.) A tossed water balloon flattens when it lands on the grass. d.

If a group of workers can apply a force of 1,275 newtons to move a crate 26 meters, what amount of work will they have accomplished

What are sun spots?

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?