A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min?
a. 11 A
b. 2.8 A
c. 8.3 A
d. 2.1 A
e. 3.6 A
a
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A steel bolt (area 5 130 mm2, Es 5 210 GPa) is enclosed by a copper tube (length 5 0.5 m, area 5 400 mm2, Ec 5 110 GPa) and the end nut is turned until it is just snug. The pitch of the bolt threads is 1.25 mm. The bolt is now tightened by a quarter turn of the nut. The resulting stress in the bolt is approximately:
(A) 56 MPa
(B) 62 MPa
(C) 74 MPa
(D) 81 MPa
Are comets common? Explain why or why not
What will be an ideal response?
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.300. What is the force exerted by friction on the car?
A) 1590 N B) 3430 N C) 7240 N D) 7820 N E) 795 N
A 1 newton apple hangs from a tree branch. The force by the apple on Earth
A) cannot be determined from the given information, because the mass of the earth needs to be given. B) is 1 newton downward. C) is 1 newton upward. D) is zero. E) is much smaller than 1 newton, but not zero.