A train travels 90 kilometers in 4 hours, and then 82 kilometers in 1 hours. What is its average speed?

The universal law of gravity states that all objects attract all other objects. Why is this considered a universal law? a. Gravity is a principle that is in effect at all times. b. The universe has many objects in it that have gravity. c.

What are the main reasons why excess weight affects physical fitness? 1. The heart has to pump harder. 2. It is more difficult to exercise. 3. The person sweats more. 4. The person does not see results from the exercise. 5.

The alkali metals all react vigorously with water. Which alkali metal would react to the greatest extent if you have equal amounts of each? A) K B) Li C) Na D) Rb

What is the potential energy of a one kilogram box of chocolates hidden on a shelf in the pantry 2 meters above the floor? a) 96.1 J b) 2 J c) 19.6 d) 9.8 J

A 85-kg astronaut is stranded from his space shuttle. He throws a 1-kg hammer away from the shuttle with a velocity of 17 m/s. How fast will he be propelled toward the shuttle, in m/s? (Round your answer to one decimal place if necessary.)

Compare and contrast the average kinetic energy of 0.5 L of coffee at 34°C, 0.5 L of coffee at 38°C, and 0.25 L of tea at 43°C.

A 7700-kg box car traveling at 14 m/s strikes a second car at rest. The two stick together and move off with a speed of 5.0 m/s. What is the mass of the second car?

What will happen if there is a change in a magnetic field?

Question 2 10 pts The voltage in a particular circuit is 10.0 V. The current in the circuit is 20 A. What is the resistance? A. 2.0 B. 30 C. 200 D. 0.5

Where in the motion is the magnitude of the net force on the object a maximum? where in the motion is the speed a maximum?