A person pours 330 g of water at 45°C into an 855-g aluminum container with an initial temperature of 10°C. The specific heat of aluminum is 900 J/(kg?K) and that of water is 4190 J/(kg?K)
What is the final temperature of the system, assuming no heat is exchanged with the surroundings? A) 28°C
B) 32°C
C) 31°C
D) 33°C
E) 35°C
B
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A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s b. 0.63 s c. 0.69 s d. 0.59 s e. 0.47 s
The radioactivity in wastes from nuclear reactors decays away quickly
What will be an ideal response?
To make an uncharged object have a positive charge:
A) remove some neutrons B) add some neutrons C) add some electrons D) remove some electrons E) heat it to cause a change of phase
The focal length of the lens of a simple camera is 40.0 mm. How far must the lens be moved to change the focus of the camera from a person 25 m away to one that is 4.0 m away?
A) 0.2 mm B) 0.3 mm C) 0.4 mm D) 0.5 mm E) 0.7 mm