The density of a rock will be measured by placing it into a graduated cylinder partially filled with water, and then measuring the volume of water displaced. the density d is given by d = m/(v1 − v0), where m is the mass of the rock, v0 is the initial volume of water, and v1 is the volume of water plus rock. assume the mass of the rock is 750 g, with negligible uncertainty, and that v0 = 500.0 ± 0.1 ml and v1 = 813.2 ± 0.1 ml. estimate the density of the rock, and find the uncertainty in the estimate.

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?