12
an object is thrown horizontally off a cliff with an initial velocity of 5.0 meters per second. the object strikes the ground 3.0
seconds later. what is the horizontal speed of the object 1.0 second after it is released? neglect friction.
1 5.0 m/s
2 10. m/s
3 15 m/s
4 30. m/s

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?

Convection occurs when thermal energy is transferred by the movement of

Why should the wavelength scale of spectroscope be calibrated