A cart starts from rest and accelerates uniformly at 4.0 m/s2 for 5.0 s. It next maintains the velocity it has reached for 10 s. Then it slows down at a steady rate of 2.0 m/s2 for 4.0 s. What is the final speed of the car?
A) 12 m/s B) 16 m/s C) 20 m/s D) 10 m/s
A
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The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is constant.
b.
its speed is increasing.
c.
its speed is decreasing.
d.
its speed is a maximum.
e.
its speed is a minimum.
A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is 10 times the wavelength of the most intense EM radiation at 300 K
Indicate whether the statement is true or false
Which spectrum is shown above?
a. emission
b. absorption
c. continuous
d. blackbody
The outward pressure of hot gas in the Sun:
A) is balanced by the inward gravitational pressure. B) is increasing the Sun's diameter. C) is cooling the photosphere. D) is responsible for variations in the sunspot cycle. E) weakens the magnetic field.