What features should you look for in a crash helmet, and why?

A tennis player hits a ball 2.0m above the ground. The ball leaves his racquet with a speed of 20m/s at an angle of 5.0 degrees above the horizontal. The horizontal distance to the net is 7.0m and the net is 1.0m high.

What light is NOT in the visible light spectrum

How does temperature increase?

determine the magnitude and direction of the resultant for a combination of the vectors A: 10.1m, 60 degrees B: 7.3m, 275 degrees

At the surface of the moon, the gravitational attraction is 5.37 ft/s2. What is the mass of the object on the surface of the moon

Which of the following statements about Em waves is true? A. Em waves all have the same speed B. Em waves all have the same wavelength C. Em waves only travel through water D. Em waves all have the same amount of energy

A teacher has asked four students to state a scientific theory. Which student is correct?

What are the two main currents that affect the US on the east and west coast?

What role do volcanoes play in the flow of energy and cycling of matter on earth?

How does uniform linear motion differ from uniform circular motion?