The kinetic energy needed by the man is
Explanation:
The escape velocity (the speed needed by an object in the Earth's surface to escape the Earth's gravitational field) is given by
where
G is the gravitational constant
M is the Earth's mass
R is the radius of the Earth
For the Earth, we have
Substituting, we find the escape velocity:
Now we can find the kinetic energy that the man would need, which is given by
where
m = 65 kg is the mass of the person
is the escape velocity
Substituting,
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C. Switches R and T only.
These 2 switches will begin to connect the solar panel to the battery and start to power up the battery without turning on the lightbulb.
Answer:
1.
Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years.
2.
Sirius, also known as the Dog Star or Sirius A, is the brightest star in Earth's night sky. The name means "glowing" in Greek — a fitting description, as only a few planets, the full moon and the International Space Station outshine this star.
For any circuit element, the power is equal to the voltage difference across the element multiplied by the current. By Ohm's Law, V = IR, and so there are additional forms of the electric power formula for resistors. Power is measured in units of Watts (W), where a Watt is equal to a Joule per second (1 W = 1 J/s).
Answers:
a) 13 s
b) 0.362 m/s
Explanation:
We have the following data:
is the mass of the mass damper
is the length of the pendulum
is the amplitude
<h3>a) Period of oscillation:</h3>
This can be solved by the following equation:
(1)
Where:
is the period
is the acceleration due gravity
(2)
(3)
<h3>b) Maximum Velocity:</h3>
The velocity in a pendulum is maximum when the pendulum is in its mean position and the amplitude is maximum. So, the equation in this case is:
(4)
(5)