ne 9-volt battery contains 19.7 thousand joules of energy.  A 4-pack of 9-volt batteries cost $10.31 at Lowe's.   Estimate the cost of battery energy in dollars per kilowatt-hour

When running on its 11.4 V battery, a laptop computer uses 8.3 W. The computer can run on battery power for 8.5 h before the battery is depleted. Part A. What is the current delivered by the battery to the computer?Express your answer with the appropriate units. Part B. How much energy, in joules, is this battery capable of supplying?Express your answer in joules. Part C. How high off the ground could a 75  kg  person be raised using the energy from this battery?Express your answer with the appropriate units.

Suppose a battery operates a 2.25 W electric clock for 19.5 months. 1. What is the available energy content, in joules, of the battery? 2. How many years can a battery that supplies 7.75 × 104 J run a pocket calculator that consumes energy at the rate of 1.05 × 10-3 W?

A power of 120 kWkW (1.2×105 WW) is delivered to the other side of a city by a pair of power lines, between which the voltage is 12,000 VV. Part A - If each of the two lines has a resistance of 10 ΩΩ, find a change of voltage along each line. (Think carefully. This voltage change is along each line, not between the lines.). P = Part B - Find what is the power expended as heat in both lines together (distinct from power delivered to customers). P =

Skydiving is one situation where air resistance cannot be ignored. Suppose a particular skydiver (with all their gear) has a mass of 63 kg. Given what you know about Newton's Second Law of Motion and the force of gravity near Earth, what force must air resistance be exerting on the skydiver when they have reached terminal velocity?

With a 1200 W toaster, how much does it cost to make a slice of toast (cooking time = 1.5 minute)? Electricity costs 8 cents per kW.h. cents

The energy needed to run an electric circuit can be expressed by E=IVt, where I is the electric current in the circuit, V is the voltage across the circuit, and t is the amount of time that it runs. How much time would it take a 2000 kg electric car to go from rest to a speed of 35 m/s if the electric motor runs on 375 V and the system uses 628 Amps of current while accelerating?   Note for formula:  I is uppercase i.