20 pts! pls! the following devices depend on energy transformations. for each device, name the form of energy that is transformed and the resulting form of energy. 1)an electric light bulb energy is transformed into energy and energy. 2) a battery is transformed into energy and energy.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.

Which statements did both aristotle and ptolemy assume? check all that apply.