A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?
A. 12 kN
B. 17 kN
C. 13 kN
D. 5.0 kN
E. 49 kN
Answer: D
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Two wires, each having a weight per unit length of 1.0 × 10?4 N/m, are strung parallel, one 0.10 m above the other. If the wires carry the same current, though in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?
What will be an ideal response?
Which of the following are electrically neutral?
A) protons B) neutrons C) electrons D) ions E) none of the above
The average intensity of the sunlight in Miami, Florida, is 1060 W/m2. What is the average value of the force exerted on a 16m2 surface that absorbs this light?
A) 7.83 × 10-5 N B) 1.63 × 10-5 N/m2 C) 2.61 × 10-5 N D) 5.65 × 10-5 N E) 0.204 × 10-5 N
To multiply an applied force while using a simple hydraulic lift, your force should be applied to the
A) large-diameter piston. B) small-diameter piston. C) relative piston sizes don't matter