Mats in a gym, airbags, and padding in sports uniform are used to protect people from being injured. Explain why these soft objects are used instead of rigid objects using your understanding of impulse and change of momentum.

A small diameter lead ball and a large diameter rubber ball are dropped from a tower. The balls hit the ground at the same time. What conclusion can be drawn about the force of gravity?

If Aluminum has 13 protons, 14 neutrons and 13 electrons, what is its atomic mass? 26 14 27 13

When can liquid water remain above 100 C?

A car traveled a distance of 80 km in 45 minutes (0.75 hours) what was the speed of the car

Atoms with the same atomic number but different atomic mass are called

The intrapleural pressure is - 4 mmHg relative to atmospheric and the transpulmonary pressure is 5 mmHg relative to atmospheric.

A hot-air balloon is 150 feet above the ground when a motorcycle passes directly beneath it (traveling in a straight line on a horizontal road). The motorcycle is traveling at 40 mph.

How do I calculate initial speed by using the slope of a graph? The graph shows the relationship between S { (sin2ϴ) / g} and the average range of a projectile in meters.

You push a 50 kg wooden box across a wooden floor at a constant speed of 1.0 m/s. The coefficient of kinetic friction is 0.15. Now you double the force on the box. How long would it take for the velocity of the crate to double to 2.0 m/s?

A star is in hydrostatic equilibrium when the outward push of pressure due to core burning is exactly in balance with the inward pull of gravity.