Physics, 06.12.2019 02:31 wasscrackin
Rhea kicks a soccer ball at 13 km/h to sean. after kicking the ball, the speed of the soccer ball from rhea’s reference frame is 13 km/h. the speed of the soccer ball from sean’s reference frame is 22 km/h.
a. rhea is standing still after kicking the ball, and sean is running.
b. sean is standing still, and rhea is running while kicking the ball.
c. both soccer players are standing still after the ball is kicked.
d. both soccer players are running while the ball is in motion.
Answers: 2
Physics, 21.06.2019 18:00
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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?
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