The observer can conclude that the sound is moving away from them and that its speed is increasing.
Answer: 2.7 x 10^5 joules
Explanation:
Given that:
Time taken = 3 minutes
convert time in minutes to seconds
(Since 1 minute = 60 seconds
3 minutes = 3 x 60 = 180 seconds)
Power of toaster = 1500 watt
Work done by the toaster = ?
Recall that power is the rate of work done per unit time
i.e Power = work/time
work = Power x Time
Work = 1500 watt x 180 seconds
Work = 270000J
Place the result in standard form
270000J = 2.7 x 10^5J
Thus, 2.7 x 10^5 joules of work is done by the toaster.
The work done to "HOLD" a load of bricks at any height is zero.
Work is done only when force acts through a DISTANCE.
The work done to LIFT 30 kg of anything to 20m higher than
it already is, is
(force) · (vertical distance)
= (mass) · (gravity) · (vertical distance)
= (30 kg) · (9.8 m/s²) · (20 m)
= 5,880 joules
Answer:
W = 47040 J
Explanation:
Given that,
The mass of a student, m = 60 kg
Height of the tower, h = 80 m
We need to find the work done in climbing the tower. The work done is given by :
W = mgh
So,
W = 60 × 9.8 × 80
W = 47040 J
So, the required work done is 47040 J.
Answer:
8.33 m/s, 36.87° North of East
Explanation:
= Mass of car = 1000 kg
= Velocity of car = 15 m/s
= Mass of truck = 2000 kg
= Velocity of truck = 10 m/s
M = Combined mass = 1000+2000 = 3000 kg
Momentum
Momentum of car traveling East is 15000 kgm/s
Momentum of truck traveling North is 20000 kgm/s
Angle
As the two vehicles are vectors, the resultant velocity is
Velocity of the two vehicles when they are locked together is 8.33 m/s and direction is 36.87° North of East
