1.3 The velocity of a moving car was observed and recorded at different time
intervals as shown in the table below.
Time
Velocity
0
20
5
40
10
60
15
80
20
80
25
0
1.3.1
Draw the velocity/time graph of the motion of the car over 25 s.
1.3.2
Calculate the acceleration during the first 15 seconds.
1.3.3
Calculate the displacement after the first 20 seconds.
1.4.4
Calculate the acceleration during the last 5 s​

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?