How much heat is necessary to change 30 g of water at 10°C into water at 80°C?
a. 0.21 kcal
b. 2.1 kcal
c. 4.5 kcal
d. 0.51 kcal
b
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Slanting Surfaces Without Friction: A system consisting of blocks, a light frictionless pulley, a frictionless incline, and very light connecting wires is shown in the figure. The wires pull on the left-hand blocks parallel to the surface of the ramp. The 9.0-kg block accelerates downward when the system is released gently from rest.(a) What is the magnitude of the acceleration of the 9.0-kg block?(b) What is the tension in the wire connecting the two blocks on the incline?
What will be an ideal response?
The symbol indicating the atomic number of a nucleus is __________
Fill in the blank(s) with correct word
Consider three galaxies, Alpha, Beta and Gamma. An observer in Beta sees the other two galaxies each moving away from him in opposite directions at speed 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c
A loop of wire is oriented in the magnetic field as shown (the plane of the loop is perpendicular to the direction of the magnetic field and the magnetic field strength increases with height). Which of the following is true? 
A. There will be an induced current only if the loop is moved to the right B. There will be an induced current only if the loop is moved to the left C. There will be an induced current only if the loop is moved upward D. There will be an induced current if the loop is moved either up or down E. There will be an induced current only if the loop is moved downward