What is the difference between a rock that shows porphyry and a rock called tuff?

A ball has a mass of 140 g. what is the force needed to accelerate the ball at 25 m/s2?

If a motor neuron involved in a reflex arc is damaged, which event in that arc is least likely to occur?

An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away Fig. below).

Hint: This problem requires a train of logic. (1) Analyze force diagram, (2) use Newton's Laws, and (3) solve the equations of motion. A block starts from rest at a height of 3.9 m on a fixed inclined plane. The acceleration of gravity is 9.8 m/s 2.

Describe the process you used to build a model

The weight of an astronout is 60kg on earth, find the wight of the same object on the planet where the gravitational attraction has been reduced to 1/10 of the earths pull

Describe a situation in wich static friction is useful

What is the effect of the magnetic field on the protons? View Available Hint (s) What is the effect of the magnetic field on the protons? The protons are accelerated to the left, toward the S magnetic pole.

following statement supports which theory? "Astronomers have observed protoplanetary disks around distant newborn stars." Big Bang theory Nebular theory Cell theory String theory

For radio broadcast, sound signals are converted to a. ultraviolet waves. b. infrared waves. c. visible light waves. d. electromagnetic waves.