Answer:
When work is done on an object, energy is transferred. The rate at which this energy is transferred is called power. So the more powerful a device is, the more energy it will transfer each second. This is important when considering the total cost of electricity used as shown on an electricity bill.
Answer:
The super ball has a greater change in momentum.
Explanation:
50 g = 0.05 kg
The change in momentum of the clay ball going at 1m/s then stick (0m/s)
As the superball change its velocity from 1m/s to -0.8m/s in opposite direction, its change in momentum would be
Since 0.09 > 0.05, the super ball has a greater change in momentum.
Answer:
A. Volume is unchanged
Explanation:
= initial pressure of the gas = 722 torr = 96258.7 pa
= final pressure of the gas = 0.950 atm = 96258.75 pa
= initial temperature = 32 °F = 272.15 K
= final temperature = 273 K
= initial volume
= final volume
Using the Equation
Inserting the values
Hence the volume is unchanged.
Answer:
Option (c) : +f
Explanation:
Sign convention is based on cartesian system with Optical Centre as vertex, therefore, focal length of a convex mirror is +ive.
ball drops 45m under g=10m/s/s
45=1/2x10xt^2 ... application of kinematic equaion from rest
90/10=t^2
t=3
24.0 m in 3 secs => 8m/s no air resistance