Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
a. 41 J
b. 16 J
c. 64 J
d. 10 J
e. 80 J
c
Physics & Space Science
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150 kcal of heat raises the temperature of 2.0 kg of material by 400 F°. What is the material's specific heat capacity?
A) 1.35 kcal/kg?C° B) 1.31 kcal/kg?C° C) 0.75 kcal/kg?C° D) 0.34 kcal/kg?C° E) 0.19 kcal/kg?C°
Physics & Space Science
Rotational Kinetic Energy: A wheel having a moment of inertia of 5.00 kg ? m2 starts from rest and accelerates under a constant torque of 3.00 N ? m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
A. 57.6 J B. 64.0 J C. 78.8 J D. 122 J
Physics & Space Science
What type of galaxy was observed by Tully and Fisher?
Physics & Space Science
At what point is the Moon farthest away from Earth?
a. apogee
b. perigee
c. umbra
d. penumbra
e. prominence
Physics & Space Science