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What are Gs? And why do they increase with speed?

A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is:
a) 80 J
b) 32 J
c) more than 80 J
d) 8 J
e) 6 J

Which best describes what occurs when a body accelerates?

Question
Explain the phenomenon behind free fall.

A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold?

What has the most kinetic energy?
A. particles of ice $0°\mathrm{C}$
B. particles of water at $0°\mathrm{C}$
C. particles of water at hundred degrees Celsius
D.particles of steam at a hundred degrees Celsius

The force that holds the planets in their orbits around the Sun, is:
Electrostatic force
Gravitational force
Nuclear force
Magnetic force

There is a correlation between temperature and kinetic energy of particles?

What is the unit of potential energy?

The tendency of an object to resist the change in the state of its motion is called ______. Amass Bforce Cfrictional force Dinertia

Pressure of 1 atm is _________ Pa

Find the y velocity $v_y(x,t)$ of a point on the string as a function of x and t
Express the y velocity in terms of $\mathrm{\omega <!--\; \omega \; -->},A,k,x$ and t

Which of the following accurately describe some aspect of gravitational waves? Select all that apply.
(A) Gravitational waves come from funnel-shaped regions of the universe
(B) Gravitational waves are predicted to travel through space at the speed of light
(C) The existence of gravitational waves is predicted by Newton's universal law of gravitation
(D) The first direct detection of gravitational waves came in 2015
(E) The existence of gravitational waves is predicted by Einstein's general theory of relativity
(F) Gravitational waves carry energy away from their sources of emission
(G) Gravitational waves are an extremely low-energy form of light

A 5 kg box is pushed 3 meters across the floor by a force of 10 N. How much work is done on the box?
A 5 kg is pushed 3 meters across the floor by a force of 10 N in 6 seconds. How much power output is exerted on the box?br>A 20 kg cart is moving at 2 m/s. How much kinetic energy does it have?br>An elevator lifts a 50 kg person from the ground level to a point where they have 10,000 J of gravitational potential energy. How much work did the elevator do on the person?
If car A is 500 kg traveling at 5 m/s hits car B, 250 kg moving in the same direction at 2 m/s, what is the initial momentum of car A?

What is the kinetic energy of the reaction products (helium nucleus plus photon)? $K_{He}+K_{\mathrm{\gamma <!--\; \gamma \; -->}}=???$ joules

An orthodontic spring, connected between the upper and lower jaws, is adjusted to provide no force with the mouth open. When the patient closes her mouth, however, the spring compresses by 6.0 mm. What force is exerted if the spring constant is 160 N/m?

Moving train has mechanical energy in the form of only potential energy.
True or False

Distance travelled per unit time is called ___.

L=Iw is not always true for all bodies. why?

A rotating wheel's rim's point's angular position is determined by $\mathrm{\theta <!--\; \theta \; -->}=4t-<!--\; -\; -->3t^2+t^3$, where $\mathrm{\theta <!--\; \theta \; -->}$ is in radians and t is in seconds. What is the instantaneous angular acceleration at $t=2$ sec?
1) $4rad/s^2$
2) $2rad/s^2$<br.3) $6rad/s^2$
4) $3rad/s^2$