How does the law of the conservation of mass relate to "You can't get something for nothing

A man runs at the speed of 10km/hr. how much time will he take to cover 750 meters?

What is the current hypothesis on how the Earth was formed?

A child swings on a playground swing. How many times does the child swing through the swing's equilibrium position during the course of 3 period (s) of motion. times

Explain, using the kinetic theory of matter, why liquids and solids are much denser than gases

Scientist use conversion factors to express the given value of a unit different type of unit true or false

Two copper wires with different diameters are joined end to end. If a current flows in the wire combination, what happens to electrons when they move from the larger-diameter wire into the smaller-diameter wire?

A baseball player is warming up and tosses a ball straight up into the air. The ball travels up until it reaches some maximum height, and then falls back down to the player/'s hand.

Volume can be measured in liters or cubic meters. a. T b. F

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude of vibration?

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? a. W1 is zero, and W2 is positiveb. W1 = - W2c.