Is average speed a scalar or vector quantity? why?

A container holds 64 atoms of a radioactive isotope. This isotope has a half-life of 1.5 months. How many atoms of the radioactive isotope will be in the container after 3 months, or two half-lives.

Parasaurolophus was a dinosaur whose distinguishing feature was a hollow crest on the head. The 1.5-m-long hollow tube in the crest had connections to the nose and throat, leading some investigators to hypothesize that the tube was a resonant

velocity graph of a particle moving along the x-axis. Its initial position is x0 = 2m at t0 = 0. At t = 3 s, what are the particle's (a) position, (b) velocity, and (c) acceleration?

The ratio of useful energy output to total energy input is called energy.

What is the effect of force on friction?

The amplitude of oscillation is the maximum distance between the oscillating weight and the equilibrium position.

A runner makes one lap around a 200m track of 25s. What were the runners average speed and average velocity?

Which change occurs when an atom undergoes alpha decay?

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 8.44 rev/s when the length of the chain is 0.600 m. When he increases the length to 0.

A moving small car has a head-on collision with a large stationary truck 7.3 times the mass of the car. Which statement is true about the direction of the car after the collision if the collision is elastic?