How do you find the density of a substance?

An arrow is shot at a 30 degrees angle with the horizontal. It has a velocity of 49 m/s. How high up does it go?

Suppose two stars are located in region a of the h-r diagram shown in the figure below. Star X appears much dimmer that Star Y as seen from Earth. Which Star can be inferred to be nearer to Earth, and how do you know?

A computer hard disk starts from rest, then speeds up with an angular acceleration of 190 rad/s2 until it reaches its final angular speed of 7200 rpm. How many revolutions has the disk made 10.0 s after it starts up?

On a spring scale that measures force, a reading shows the force of an object to be about halfway between 7 N and 8 N. Which of the following would be the most accurate measurement for the force? Question 8 options: 0.0075 N 0.75 N 750 N 7.5 N

In a system, when potential energy decreases, then entropy also decreases. True False

Two pieces of metal with exactly the same mass are placed on a surface in bright sunlight. The temperature of the 1st block increases by 3°C while the temperature of the 2nd increases by 8°C. If the specific heat of the 2nd block is 0.

The correctly balanced equation for H202 - H2O + O, is A) H202 - 2H2O + O2 B) H302 - H20+20, C) 2H, 02 - - 4H20 + 0, D) 2H, 02 - 2H30 + 0,

What happens to the wavelength of a wave if you increase the frequency?

In a transverse wave, the particle motion is what to wave motion? A. perpendicular B. parallel

Which agent of weathering breaks down limestone statues?