Alaptop can convert 400j of electrical energy into a 240j of light and sound. what is the efficiency? where does the rest of the energy go?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?