What is the momentum in kg m/s of a 42.9 g golf ball traveling at 78.2 m/s? If the impact of the golf club on the ball occurs over a time of 2 x 10^-3 seconds, b). what force does the ball experience to accelerate from rest to 78.2 m/s?

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.

Ideal meters problem. what internal resistance is ideal for a voltmeter? what internal resistance is ideal for an ammeter?