If you stick to the usual definition of Work = (force) x (distance), then the answer
is zero. The microwave oven doesn't exert any mechanical force on the leftover
meatloaf, and at the end of the 5 minutes of cooking time, the meatloaf is in the
exact same place where it started. So 'force' and 'distance' are both zero.
But if we recognize that 'work' is just a transfer of energy, then we can easily
calculate the cooking energy that the oven pumps into its cooking chamber.
Remember that 1 watt = 1 joule per second.
(500 joule/sec) x (5 min) x (60 sec/min) = <em>150,000 joules</em>
Since the ball was not moving before it let Aiden's hand, the formula used to calculate the acceleration is
, where a is acceleration, v is velocity and t is the time. We put them in the formula and get
The acceleration is 490 m/s^2
Answer:
Explanation:
Electrical energy is the correct answer
A)
1 year = 365 days x 24 hours per day x 60 minutes per hour x 60 seconds per minute
Seconds in one year = 31536000 seconds
Distance covered = 2.99 x 10⁸ x 31536000
= 9.43 x 10¹⁵ m
B)
9.43 x 10¹⁵ / 1.5 x 10⁸
= 6.29 x 10⁷ AU
C) 2.99 x 10⁸ m/s x 60 s/min x 60 min/hr x 1AU/1.5 x 10⁸ m
= 7176 AU/hr