What is a Vector and a scalar?

Constant speed has a slope of zero on a graph because no acceleration is taking place

Radioactive materials are used in smoke detectors. as the smoke comes in-between the radioactive source and the sensor, an alarm goes off.

Angie is moving a couch with a mass of 48 kg. she moves it in 120 seconds using 240 j of work. what is her power output

A car traveling at 21 m/s starts to decelerate steadily. It comes to a complete stop in 13 seconds. What is its acceleration?

What are the two main forces in a star

Planetary nebulae are characterized by an emission spectrum consisting of Balmer (hydrogen) emission lines and a pair of strong emission lines at 4959˚A and 5007˚A that were quite mysterious when first seen.

What is the mass of oxygen in an oxygen tank at 20 C if the tank has a volume of 0.20 m3 and the oxygen pressure in the tank is 4.0 105 N/m2 (mass of one mole of one mole of oxygen is 16 g and the universal gas constant is 8.

What is one advantage infrared astronomy has over visible light astronomy?

A 60-kg runner raises his center of mass approximately 0.5 m with each step. Although his leg muscles act as a spring, recapturing the energy each time his feet touch down, there's an average 10% loss with each compression.

Two cyclists who weigh the same and have identical bicycles ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob.