Express 50°C in °F
A)
50°F
B)
45.6°F
C)
59.8°F
D)
122°F
E)
148°F
D
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A large stick is pivoted about one end and allowed to swing back and forth with no friction as a physical pendulum. The mass of the stick is 5.40 kg and its center of gravity (found by finding its balance point) is 1.80 m from the pivot
If the period of the swinging stick is 6.90 seconds, what is the moment of inertia of the stick about an axis through the pivot?
A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is negligible. (a) Calculate the time required for the ball to rise to its maximum height
(b) Calculate the maximum height reached by the ball above the point where it hit the bat. (c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat. (d) Explain why there are two answers to part (c).
What temperature is required to fuse hydrogen?
A) thousands of Kelvin B) millions of Kelvin C) billions of Kelvin D) trillions of Kelvin E) any temperature, as long as gravity is strong enough
What is the mass number of alpha particles?
A) 1 B) 2 C) 3 D) 4 E) 6