A physics student drops a rock from a 55m cliff. How long does it take to hit the ground?
2 answers:
A physics student drops a rock from a 55 m cliff, it takes 3.35 seconds to hit the ground.
<u>Solution:</u>
Using the second equation of motion,
Where, U= initial velocity of ball
S = distance at which rock is dropped from cliff = 55 m
t = time period
a = acceleration due to gravity = 9.8 m/s
Since the ball is dropped from cliff, initial velocity is zero.
u = 0
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Answer:
a
The output power is
b
The Amplitude would decrease by
Explanation:
From the question we are told that
The diameter of the steel wire is = 1.0mm
The raduis of this steel wire is
Now from the question we can deduce that the power output is equal to the power being transmitted by wave on the wire this is mathematically represented as
Where is the mass per unit length of the wire
This is mathematically evaluated as
Where a is the area of the the wire =
is the density of steel with a generally value of
So
is velocity of the wave
This is mathematically evaluated as
substituting 60Hz for f
We have
is the amplitude with a given value of 0.50 cm
v is the linear velocity of the wave
This is mathematically evaluated as
Where T is the tension with a given value of
Substituting values into equation 1
Since the doubling of the frequency does not affect the amplitude and from equation one the output power is of the Amplitude, Then the Amplitude would decrease by
Answer:
a) The strength of gravity decreases if one moved away from Jupiter
b) The strength of gravity increases if one fell into Jupiter
Explanation:
The gravitational attraction is given by Newton law of gravitation as follows;
Where;
G = The universal gravitational constant = 6.67408 × 10⁻¹¹ m³/(kg·s²)
M = The mass of Jupiter
m = The mass of the nearby body
R = The distance between the centers of Jupiter and the body
From the equation, we have that the gravitational strength varies inversely with the square of the separation distance between two bodies
Therefore, as one moves away, R increases, and the strength of gravity reduces
Similarly as the body falls into Jupiter, R, reduces the gravitational strength increases.