Other Physics Answers

A kettle contains 0.6kg water. The heat absorbed by the water is 18Js-1 in 20 minutes. Calculate the rise in temperature of the water [Specific heat capacity of water=4200 Jkg-1Celcius-1]

A kettle contains 0.6kg water. The heat absorbed by the water is 18Js-1 in 20 minutes. Calculate the amount of heat absorbed by the water [Assume that no heat is lost to the surrounding]

Determine the image distance and image height for a 5.00-cm tall object placed 20.0 cm from a concave mirror having a focal length of 15.0 cm.

a. di = 60.0 cm and hi = -15.0 cm

b. di = -60.0 cm and hi = 15.0 cm

c. di = 30.0 cm and hi = -15.0 cm

d. di= -30.0 cm and hi=15.0 cm

How long does it reach for a particle to reach a distance of 100 km If its average velocity is 100 m/s

A force F~ = Fx ˆı + Fy ˆ acts on a particle that undergoes a displacement of ~s = sx ˆı + sy ˆ where Fx = 3 N, Fy = −1 N, sx = 5 m, and sy = 2 m. Find the angle between F~ and ~s.

Three warehouse workers are moving a heavy crate from the warehouse to the truck. Looking at them from a top-down view, worker A pulls the box to the North with a force of 10N, worker B pulls the box to the West with a force of 17N, and worker C pulls the box to the South with a force of 20N. The box moves a total of 18m, 20° S of W with the force of the workers. What is the work done by Worker C?

a. A transformer is used to change the 230 volt mains electricity supply to the 12 volts

needed to operate a low voltage halogen lamp. The current through the halogen lamp

is 4 amps. Assuming that the transformer is 100 % efficient determine the:

i. current drawn by the transformer from the mains electricity supply.

An electric device is designed to dissipate 990 W of power when connected to a 110 V source. Compute: current drawn

If a 900.0 kg sports car slows to 15.0 m/s to check out an accident scene and the 1500.0 kg pick up behind him continues traveling at 35.0 m/s, with what velocity will the two move if they lock bumpers after a rear-end collision?

Mark, a 65.0 kg skin diver, shoots a 4.0 kg spear with a speed of 25 m/s at fish who darts quickly away without getting hit. How fast does Mark move backwards when the spear is shot?