Which of the following is true about high-energy mechanical devices?

Why did Thomson's results from experimenting with cathode rays a big change in scientific thought about atoms?

The work done on an elevator that has a mass of 1000kg and lifted 4m in 10 seconds is how many joules.

Radon, the radioactive gas that contributes more than half the yearly dose to the average American, has a half-life of approximately 4 days. How many days does it take a radon source to decay to 1/128 of its original level of radioactivity?

The gulf stream begins at the tip of Florida and flows up all the way to NW Europe causing what? A. The gulf stream does not go to NW Europe. B. colder climate C. storms D. warmer climate

Ilya and Anya each can run at a speed of 7.70 mph and walk at a speed of 4.00 mph. They set off together on a route of length 5.00 miles.

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

A wave has a wavelength of 7 mm and a frequency of 9 hertz. What is its speed?

Which statement best describes the effect of scientific advances on society? A. They always have a positive impact on society. B. They are inspired by the needs of society. C. they do not affect society beyond the community level. D.

Which is the best example of reusing? repairing a stove instead of buying a new one wearing a pair of pants made from cotton buying a toy packaged in paper instead of plastic placing a glass bottle in the recycling bin

The sunlight hits the surface of a lake this will like caused a. condensation b. transpiration c. evaporation d. sublimation