Astronomy question,

what keeps supernova explosions from being seen?

A heat engine: A) converts heat input to an equivalent amount of workB) converts work to an equivalent amount of heat C) takes heat in, does work, and loses energy heat D) uses positive work done on the system to transfer heat from a low temperature

Potassium hydroxide and phosphoric acid react to form potassium phosphate and water according to the equation: 3KOH (aq) + H3PO4 (aq) K3PO4 (aq) + 3H2O (l) Determine the starting mass of each reactant if 62.1 g of K3PO4 is produced and 80.

If the period of the pendulum is tripled, what is the length of the string increased by?

A miniature light bulb with resistance of 3 ohms is connected to a 6-volt source. How much current will flow through the bulb?

A 4-kg cat is resting on a bookshelf that is 2 m high. What is the cats gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8m/s^2? a. 6 J b. 8 J c. 20 J d. 78 J

What is the critical angle θcrit for light propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1.00? express your answer in radians?

Which of these could NOT be used to find the mechanical advantage of an inclined plane? A. input force B. output force C. percent efficiency D. length and height of inclined plane

What are the Rules of magnetism

Two spheres of the same radius, but of different masses, are both fully submerged in water. The lighter sphere is held below the water line by a rope anchored to the bottom of the container. The heavier sphere is suspended from a rope.

How does an increase in thermal energy affect molecules?