Which is NOT true about a protostar?

a. It is usually much larger than it will be as a star. b. It glows due to the heat of the gases in its core. c. It may become a brown dwarf. d. It generates pressure by fusing hydrogen.

Which properties should an object, system, or process have in order for it to be a useful standard of measurement for a physical quantity such as length or time?

At a distance of 0.220 cm from the axis of a very long charged conducting cylinder with radius 0.100cm, the electric field is 490 N/C. What is the electric field 0.616 cm from the axis of the cylinder?

In an experiment you find the mass of a cart to b 250 grams what is the mass of the cart in kilograms

Find the volume of a box measuring 2 cm by 7 cm by 3 cm.

Bob drove from home to work at 60 mph. after work the traffic was? heavier, and he drove home at 50 mph. his driving time to and from work was 1 hour and 28 minutes. how far does he live from his? job?

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.

You push a shopping cart filled with groceries (total mass = 20 kg) by applying a force to the cart 30° from the horizontal. if the force you apply has a magnitude of 86 n, what is the cart's acceleration? assume negligible friction.

Two objects are made of the same material, but they have different masses and temperatures. If the objects are brought into thermal contact, which one will have the greater temperature change

A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on the ball?

A car slows down from 24 m/s to rest in a distance of 90 m. what was its acceleration, assumed constant? incorrect: your answer is incorrect. m/s2