A 1000-kg car is slowly picking up speed as it goes around a horizontal unbanked curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.35. At what speed will the car begin to skid sideways?
A) 9.3 m/s
B) 24 m/s
C) 34 m/s
D) 35 m/s
E) 19 m/s
E
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A potential energy function for a certain system is given by U1(x) = Cx2 + Bx3. The potential energy function for a second system is given by U2(x) = A + Cx2 + Bx3, where A is a positive quantity
If an object begins at the same initial position with the same initial velocity in both systems, how is the motion in the two systems related? A) The motion in the first system will be with greater speed than in the second system because of the lower potential energy. B) The motion in the second system will be at greater speeds in one direction and lower speeds in the other direction relative to the first system. C) The motion in the two systems is identical. D) The motion in the second system will be with greater speed than in the first system because of the greater potential energy. E) The motion in the two systems will be in opposite directions.
A wire, 6.0 m long, with a mass of 10 g, is under tension. A transverse wave is propagated on the wire, for which the frequency is 280 Hz, the wavelength is 0.60 m, and the amplitude is 8.4 mm
The time, for a crest of the transverse wave to travel the length of the wire, in ms, is closest to: A) 36 B) 31 C) 40 D) 44 E) 49
If the magnetic susceptibility of a material is 5×10-6 that decreases with increase in temperature, this material is _________.
Fill in the blank(s) with the appropriate word(s).
A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
a. 60 kJ b. 45 kJ c. 75 kJ d. 90 kJ e. 230 kJ