B. False
Endothermic reactions absorb heat.
Answer:
The number of crates is 84580.
Explanation:
mass, m = 30 kg
height, h = 0.9 mm
Power, P = 0.5 hp = 0.5 x 746 W = 373 W
time, t = 1 minute = 60 s
Let the number of crates is n.
Power is given by the rate of doing work.

Multiply the numerator and denominator of the first fraction by 3. Multiply the numerator and denominator of the second fraction by 4. Subtract. 9 twelfths minus 4 twelfths equals 5 twelfths.
Answer:
14.3
Explanation:
The distance s as a function of time can be written as:

The rate of change is the derivative of d with respect to time:

The time t when the track has been traveling for 81 miles is given by:

Using t in the previous equation gives:
