What is the change in internal energy if 60 J of heat are released from a system and 20 J of work is done on the system Use U = Q - W.

A. - 40 J

B. 40 J

C. - 80 J

D. 80 J

The standard acceleration (at sea level and 45◦ latitude) due to gravity is 9.806 65 m/s2. What is the force needed to hold a mass of 2 kg at rest in this gravitational field? How much mass can a force of 1 N support?

Place the descriptions in the correct categories. rift valleys At Convergent Boundaries At Divergent Boundaries plates pulling apart magma breaks through crust subduction volcanic mountains island arc magma flows from cracks mid-ocean ridges

Two 2.5 kg physical science textbooks on a bookshelf are 0.14 m apart. What is the magnitude of the gravitational attraction between the books?

Which one of the following lines best illustrates personification? A. A narrow wind complains all day. B. Spring is a dream unsung. C. She floated graceful as a dove. D. The fog comes on little cat feet.

In the situation shown below, the safe is 5 meters off the ground. How much rope is lying on the ground?

If a car rolls gently off a vertical cliff, how long does it take to reach 90km/hr.

In the game of volleyball, what skill relates to Newton's second law

The minimum breaking distance d in feet for a typical vehicle can be modeled with the equation d (v) = 0.045v2, where v is the vehicle's speed in miles per hour.

A 2kg blob of putty moving at 4 m/s slams into a 6kg blob of putty at rest what is the speed of the to stick together blobs immediately after colliding

A stone is thrown vertically upward with a speed of 12m/s from the edge of a cliff 70 m high (a) How much later it reaches the bottom of the cliff? (b) What is its speed just before hitting? And (c) what total distance did it travel? (Ans: 5.