C: The gravitational force exerted from the planet on Moon A is two times smaller than the gravitational force exerted from the planet on Moon B.
Answer:
36.3 g
Explanation:
1.21 g/ml * 30 ml = 36.3 g ( see how the 'ml' units cancel ?)
Answer:
a.87.6 m/s
b.18.25 Hz
Explanation:
the equation for the wave speed is expressed as

where v is the speed,
T is the tension in Newton
l is the length
and m is the mass
Now since

by substituting values into the equation, we have

b. the expression for the frequency is giving as
.
Note we 2L as the wavelength because we solving for the fundamental frequency as stated in the question.
We can solve the problem by using the first law of thermodynamics:

where
is the variation of internal energy of the system
Q is the heat added to the system
W is the work done by the system
In this problem, the variation of internal energy of the system is

While the heat added to the system is

therefore, the work done by the system is
