A spring-powered dart gun is un-stretched and has a spring constant 10.0 N/m. The spring is compressed by 8.00 cm and a 5.00 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is
A. 0.020 J.
B. 0.032 J.
C. 0.060 J.
D. 0.100 J.
E. 0.120 J.
B. 0.032 J.
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If you double the length of each side of a cube, its surface area increases by what factor?
A. 2 B. 4 C. 6 D. 8
A man is holding an 8.00-kg vacuum cleaner at arm's length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is horizontal?
A) 0.242 Nm B) 4.40 Nm C) 43.2 Nm D) 14.5 Nm E) 0 Nm
First Law of Thermodynamics: A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at 25°C. Which of the following statements about these gases must be true? (There could be more than one correct choice.)
A. The internal (thermal) energy of the gas in both flasks is the same. B. The internal (thermal) energy of the gas in the larger flask is greater than the internal (thermal) energy of the gas in the smaller flask. C. The internal (thermal) energy of the gas in the smaller flask is greater than the internal (thermal) energy of the gas in the larger flask. D. The molecules in the larger flask have the same root-mean-square speed as those in the smaller flask. E. The molecules in the smaller flask have the same average kinetic energy per molecule as those in the larger flask.
An optic fiber is made of clear plastic with index of refraction of 1.50, surrounded by air. For what angles of incidence ? will light remain within the plastic fiber?
A) ? < 38.3° B) ? < 41.8° C) ? ? 21.1° D) ? > 41.8° E) ? > 38.3°