Assuming both staircases are of equal height from the ground floor, then the nature of the staircase does not change the gravitational potential energy.
We can, from information given, find the height of the floor, and then apply to the child using the standard formula, E=mgh.
However, in this case, it is a matter of proportions, i.e.
81.0 kg : 2.25 kJ
17.5 kg : x kJ
cross multiply to get
x=2.25*17.5/81=0.486 kJ (or 486 J) to three significant figures.
Answer:
v = 6.05 m/s
Explanation:
The mass of the brick, M = 21 kg
The velocity of the brick, U = 6.1 m/s
The mass of the cart, m = 2.9 kg
The velocity of the cart, u = 0.26 m/s
The combined mass of the brick and the cart, v = ?
According to the law of conservation of linear momentum,
Combined final momentum = sum of the initial momentum
(M + m)v = MU + mu
v = MU + mu / M + m
= 21 x 6.1 + 2.1 x 0.26 / (21 + 0.26)
= 6.05 m/s
Hence, the combined velocity of the cart and the brick is, v = 6.05 m/s
His acceleration is
<em>(-0.05) · (his speed at the bottom of the hill) </em>m/s²
Answer:
3m
Explanation:
p=250w
m=25.5
t=3.0s
D=x
F=mxa F= 25.5kg x 9.8m/s^2 =250N
D= 250wx3.0s/250w
3m
Answer:
It's because it tips over the threshold from nucleate boiling, which we can see, to convection boiling, which we can't. ... Even if the steam stayed in the pot, it would still stop boiling when you removed the heat. The steam and water in a liquid/vapour mixture are at the same temperature (100ºC).
Explanation:
