Radium-214 decays in an alpha decay.

a. what is the mass number of the daughter isotope

An inventor claims to have developed a power cycle having a thermal efficiency of 40%, while operating between hot and cold reservoirs at temperature th and tc 5 300 k, respectively, where th is (a) 900 k, (b) 500 k, (c) 375 k.

Which of these factors will increase the speed of a sound wave in the air

A man pushes a drum of oil 10kg up an incline OA. If OA is 5m and AB is 3m, what is the potential energy of the drum at A.

Which statement describes what happens when Bret runs up a flight of stairs? His kinetic energy increases. His potential energy decreases. His kinetic energy is converted into potential energy. His potential energy is converted into kinetic energy.

Which chemical is released by brain cells along an activated reward pathway?

When an ocean plate converges with another plate, what is created on the seafloor at the line of convergence?

Calculate the angle of refraction of 30.0° light shines from water into ice. The indices of refraction for water and ice are 1.36 and 1.31, respectively. A) 19.8° B) 31.3° C) 40.9° D) 64.0°

What is the length of a simple pendulum with a period of 2.0 s?

How many electrons are necessary to produce 1.0 c of negative charge? (e = 1.60 Ã 10-19 c) ?

A car is traveling at 64 ft/s when the brakes are fully applied, producing a constant deceleration of 18 ft/s2. What is the distance covered before the car comes to a stop? (Round your answer to one decimal place.)