Tools used as nut crackers by chimps and birds

What is the equation for rotational motion?

What are classes of stars?

If you hold a balloon by a string and the balloon moves toward your sweater and sticks there, what would you infer? A) That the balloon and the sweater have no charges. B) That the balloon and the sweater have like charges.

Two identical trucks have mass 5100 kg when empty, and the maximum permissible load for each is 8000 kg. the first truck, carrying 4300 kg, is at rest. the second truck plows into it at 60 km/h, and the pair moves away at 42 km/h.

A piece of copper at 10 °C is dropped into a glass of water at 35 °C. Which statement is correct? Heat will flow from the copper to the water in the glass until both reach the same temperature.

The weight of a 100 N laser printer is spread over 0.5m2. What is the pressure it exerts? A) 50 N/m2 B) 200 N/m2 C) 500 N/m2

Comparing and contrasting ionic and covalent bonds?

Elevation above sea level is called

The train traveled 500 kilometers north to Odessa in 2 hours. What's the train's speed? What is the velocity?

Are microwaves and radio waves faster or slower than other types of electromagnetic energy?