Answer:
Athlete A
Explanation:
Power is the rate of doing work and it is calculated as follows:
Power = work done/time taken = mgh/t
(for work being done against gravity)
So for athlete A
P = (100 kg * 9.8 N/kg* 0.6m)/0.5 s = 1176 W
For athlete B
P = (150 kg * 9.8 N/kg* 0.6m)/1 s = 882 W
For athlete C
P = (200 kg * 9.8 N/kg* 0.6m)/2 s = 588 W
For athlete D
P = (250 kg * 9.8 N/kg* 0.6m)/2.5 s = 588
There is no definite end to earths atmosphere, but technically the border between the outer space and earth gets thinner as you move up from the earths surface. The Karman line is the closest definition there is which describes the end of the earth's atmosphere, it is 100 km above earth's sea level at approximately 1.56 % of total earth's radius. This describes the boundary between the outer space and the atmosphere.
Answer : The acceleration of the elevator is,
Explanation :
Formula used to calculate the acceleration of the elevator is:
where,
F = force = 844 M
m = mass of man = 70 kg
g = acceleration due to gravity =
a = acceleration of the elevator = ?
Now put all the given values in the above formula, we get:
Thus, the acceleration of the elevator is,
Answer:
c) 860 kg
Explanation:
Cars don't really lose their mass weight when in space or in ground
Answer:
Tension= 4,373.70N
Explanation:
Ma= Sum of forces
Horizontal forces are:
0= T1costheta=T2costheta
T1=T2=T
Vertical forces are:
Ma= T1sin8°+ T2sin8° - mg
Ma= 2Tsin8° - mg
Therefore ,
T= m(a+g)/(2sin8°)
T= 68(8.10+9.8)/2×0.139
68(17.9)/0.2783
T= 4373.697
T= 4373.70N