Aman, holding a weight in each hand, stands at the center of a horizontal frictionless rotating turntable. the effect of the weights is to double the rotational inertia of the system. as he is rotating, the man opens his hands and drops the two weights. they fall outside the turntable. then:
a. his angular velocity doublesb. his angular velocity remains about the samec. his angular velocity is halvedd. the direction of his angular momentum vector changese. his rotational kinetic energy increases

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

Could we see a galaxy that is 20 billion light-years away?