a train travels 99 kilometers in 3 hours, and then 80 kilometers in 5 hours. What is it's average speed?

Which statements correctly describe laser light? Check all that apply. Laser light contains many wavelengths of light. Laser light is stronger than ordinary light. Laser light is all one color.

Calculate how much an astronaut with mass of 90 kg would weigh while standing on the surface of Mars. The acceleration due to gravity on Mars is approximately 3.7 m/s^2. Express your answer in Newtons. Show your work

You have been hired by a venture capitalist to evaluate a concept engine proposed by an inventor, who claims that the engine consumes 100 MW at a temperature of 500 K, rejects 20 MW at a temperature of 300 K, and delivers 50 MW of mechanical work.

At what height above earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?

How much force is needed to accelerate a space shuttle 15 m/s squared with a mass of 2,030,00 kg

A car speeds up from 15 m/s to 30 m/s in 12 seconds. What is the acceleration of the car?

These examples include learned and innate behavioral adaptations of animals. Which statement describes a learned behavioral adaptation of an animal? A. Your knee j e r k s when it is hit by a doctor. B. A dog shakes water from its fur. C.

Vitellium (Vi) has the following composition:Vi-188: 187.9122 amu; 10.861%Vi-191: 190.9047 amu; 12.428%Vi-193: 192.8938 amu; 76.711%Based on this data, what can you predict about the average atomic mass of vitellium?

if you have an experimental setup which has three unknowns, how many linearly independent equations do you need to determine the unknowns to find one unique solution?

What is a sedimentary rock consisting of material that was precipitated from water