Answer: His weight plus the centripetal force must equal 1170 N
Explanation:
83.0 [g + (v^2 / r)] = 1170
v^2 / 18.0 = (1170 / 83.0) - 9.81
Answer:
the correct answer is A
Explanation:
In a series circuit the current flows through the circuit and when it is opened at some point the current stops throughout the circuit.
In a parallel circuit, the current flows through the different branches of the circuit and when the current in one branch is interrupted, it continues to flow through the others.
In this exercises they indicate that the bedroom lights are turned off (the circuit was opened), but the kitchen lights are still on, therefore it is a parallel circuit with at least two branches, the current that circulates through each one depends on the existence on each branch.
Therefore the correct answer is A
Answer:
a) a = 4 ft / s²
, b) a = -6 ft / s²
Explanation:
The balance is subjected to two forces: the weight of the person directed downward and the spring reaction directed upward.
When the person rides the elevator, the acceleration is zero
F - W = 0
F = W
F = 160 lb
let's find the mass of the body
W = mg
m = W / g
m = 160/32
m = 5 slug
A) when the elevator is moving up
F - W = m a
F = W + m a
F - W / m = m a
F = m (g + a)
therefore the scale reading (F) must be higher, in this case F = 180 lb
a = F / m - g
a = 180 - 160)/5
a = 4 ft / s²
b) when the elevator is stopping
in this case the direction is opposite to the speed, that is to say downwards
F- W = m (-a)
a = W - F / m
a = 130 -160 /5
a = -6 ft / s²
Answer:
20 degrees
Explanation:
Given that,
Speeds of both snowballs is 34.8 m/s
The first one is thrown at an angle of 70◦ with respect to the horizontal. We need to find the angle at which should the second snowball be thrown to arrive at the same point as the first.
We need to find the angle at which the second snowball be thrown to arrive at the same point as the first. We can find the distances of both balls and equate them.
It means, range of both projectiles are equal. So,
We have,
So,
Hence, the second snowball is thrown at an angle of 20 degrees.