What is the best analogy for the doppler effect?

Explain why the bright spectral lines of light emitted from the atoms of an element are unique to that element

A scientist has two radioactive substances. One emits beta particles, and the other emits alpha particles. He thinks that since the alpha particles are larger, they are more dangerous to humans. What is wrong with his reasoning?

A cold block of metal is placed in contact with a warm block of metal. Which type of energy will be transferred between the blocks? thermal energy chemical energy electrical energy mechanical energy

What effects occur when heat energy is added to a system

1. A rope is used to pull a metal box 20.0 m across the floor. The rope is held at an angle of 30.00 with the floor and a force of 525 N is applied. How much work does the force on the rope do?

9. An astronaut of mass 90 kg walks in space outside her spaceship and receives a 30-N force from a nitrogen spurt gun. What acceleration does she experience?

Which of the following describes the charge of an atom before any electrons are transferred? positive charge negative charge it depends on the number of protons and neutrons neutral charge

A slow jogger runs a mile in 16 minutes. Calculate the speed in

Protecting his nest, a 600-g peregrine falcon rams a marauding 1.5-kg raven in midair. the falcon is moving at 20.0 m/s, and the raven at 9.00 m/s at the moment of impact.

A carousel has a radius of 1.70 m and a moment of inertia of 110 kg · m2. A girl of mass 44.0 kg is standing at the edge of the carousel, which is rotating with an angular speed of 3.40 rad/s.