Answer:
h = 4.04 m
Explanation:
Given that,
Mass of a child, m = 25 kg
The speed of the child at the bottom of the swing is 8.9 m/s
We need to find the height in the air is the child is able to swing. Let the height is h. Using the conservation of energy such that,
Put all the values,
So, the child is able to go at a height of 4.04 m.
F = ma = -kx
m = 0.04 kg
x = -0.02m
a = 9.81m/s²
k = ma/x = 19.6 N/m
Answer:
6.36*10^-8 N
Explanation:
The magnitude of gravitational force of attraction is usually given by the formula
F = Gm1m2/r², where
F = magnitude of the force required
G = gravitational constant, 6.67*10^-11 m3 kg^-1 s^-2
m1 = mass of the first body, 72 kg
m2 = mass of the second body, 53 kg
r = radius between the bodies themselves, 2 m
Now, when we apply the formula directly, we get
F = (6.67*10^-11 * 72 * 53) / 2²
F = (6.67*10^-11 * 3816) / 4
F = 2.55*10^-7 / 4
F = 6.36*10^-8 N
Answer:
b . is zero.
Explanation:
An Equipotential surface is the one that has electric potential same throughout the surface. The formula for work done in an electric field is given by
dW= qdV
Now, in an Equipotential surface dV= 0.
Hence the work done in moving a charge from one place to the other in an electric field is zero.
Answer:
the Hudson Bay was covered with alpine glaciers
Explanation:
During the last glacial period, large portions of North America were covered with ice. The majority of the ice was from the ice sheets that were covering Canada and the northern part of the United States, and the alpine glaciers on the mountain ranges. Hudson Bay was all frozen at this point of time. It was not covered with alpine glaciers though, instead it was covered with the ice of the extended ice sheets, with the ice cover reaching up to 2 km in thickness.
