summarize the physical reasons that sound waves travel at different speeds through different mediums

A block and tackle of six pulley is used to raise a load of 300N steadily through a height of 30m, if the workdone against friction is 2000j. Calculate; 1. The workdone by the effort 2. The efficiency of the system 3. The applied effort

A mountain climber jumps a 1.9-m-wide crevasse by leaping horizontally with a speed of 9.0 m/s ... If the climber's direction of motion on landing is - 45°, what is the height difference between the two sides of the crevasse?

A train travels 90 kilometers in 2 hours, and then 66 kilometers in 2 hours. What is its average speed?

If u blow a stream of air between two balloons that are next to each other the balloons

The sun Why does mining often result in environment Pollution?

Floating in deep space, you find yourself at rest next to a small asteroid. You reach out and tap the asteroid with a hammer. What happens to you in this process?

You walk forward at 1.5 m/s for 8s. Your friend decides to walk faster and starts out at 2.0 m/s for the first 4 s. Then she slows down and walks forward at 1.0 m/s for the next 4s. Make a distance-time graph of your motion and your friend's motion.

If the coolant in a refrigerator was not compressed back into a liquid after it flowed through the refrigerator what would happen

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i. e, what is the motion's frequency?

Which characteristic best describes how nuclear decay differs from nuclear fission?