A construction worker with a weight of 850 N stands on a roof that is sloped at 20. What is the magnitude of the normal force of the roof on the worker?

Which statement explains why the moon's gravity is able to create high and low tides? a. The moon is revolving more quickly than the Earth is rotating. b. The moon is revolving more slowly than the Earth is rotating. c.

How many foot-pounds of work does it take to throw a baseball 90 mph? a baseball weighs 5 oz, or 0.3125 lb?

Suppose the gravitational acceleration on a certain planet is only 4.0 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 24 m/s. Assume that upward direction is positive.

What is a rock that is full of tiny connected air spaces

what is the mass of a cannon ball if a force 2500 N gives the cannon ball an acceleration of 200 m/s squared?

For slowly moving objects, the drag force in water is approximately proportional to the speed of the object. The Escherichia coli (E. coli) bacterium propels itself slowly through water by means of long, thin structures called flagella.

How do electric and magnetic fields interact to create electromagnets?

Select the correct answer from each drop-down Two magnets are placed as shown in the 00 В D between the poles B and . And the force of between the poles A and DIS Reset Next

Two main pieces of evidence support the big bang theory and the idea that our universe is continually expanding: Doppler shift and cosmic background radiation. Explain how these phenomena provide evidence of the expansion of the universe.

How was bohr atomic model similar to Rutherford's model