Consider as a system the sun with venus in a circular orbit around it. find the magnitude of the change in the velocity of the sun relative to the center of mass of the system during the time venus completes half an orbit. assume the mass of the sun is 5.68 1029 kg, the mass of venus is 4.87 1024 kg, its period is 1.94 107 s, and the radius of its orbit is 1.08 1011 m. ignore the influence of other celestial objects.

Acommercial passenger jet can travel up to 970 km/hr at an altitude of 30,000 feet. at this speed, how long will it take the jet to travel 1,865 kilometers? a. 2.3 hrs b. 1.9 hrs c. 1.7 hrs d. 1.5 hrs

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?

Why should seat belts not be mandatory quick plz