What occurrence defines the end of the protostar phase of a star's life and the start of the main-sequence phase?

A particle at rest undergoes an acceleration of 1.5 m/s 2 to the right and 3.7 m/s 2 up. what is its speed after 6.4 s? answer in units of m/s.

Hydroelectric power uses: wind water coal the sun

A bus and a car have an inelastic head-on collision. The bus has a mass of 1.5 * 10^3 kilograms and an initial velocity of + 20 meters/second. The car has a mass of 9.5 * 10^2 kilograms and an initial velocity of - 26 meters/second.

What force acts between Earth and the moon? gravity mass motion newtons

Why can shell eggs be received at an air temperature of 45°f (7°c) or lower instead of an internal temperature of 41°f (5°c) or lower?

Your university radio stawon has a 5.0-kw radio transmixer that broadcasts uniformly in all direcwons; listeners within 15 km have reliable recepwon. you want to increase the power to double that range. what should be the new power?

A projectile is thrown upward so that its distance above the ground after t seconds is h (t) equals negative 16 t squared plus 704 t. a) Find the maximum height the object reaches. b) Find the time it takes the object to reach the ground.

Whats an example of projectile motion

The fact that the sun rises and sets at different times during the day depending on the time of year is an example of a data trend. True or False

What sample of matter is a single substance