A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s2, what angle does the string make with the vertical?
What will be an ideal response?
11.0 degrees
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Each plate of an air-filled parallel-plate air capacitor has an area of 0.0040 m2, and the separation of the plates is 0.080 mm
An electric field of 5.3 × 106 V/m is present between the plates. What is the energy density between the plates? (?0 = 8.85 × 10-12 C2/N • m2) A) 124 J/m3 B) 84 J/m3 C) 170 J/m3 D) 210 J/m3 E) 250 J/m3
The second postulate of special relativity states that the speed of light, when measured in a vacuum, is constant for all observers
a. True b. False Indicate whether the statement is true or false
A solid sphere of mass 1.5 kg and radius 15 cm rolls without slipping down a 35° incline that is 7.0 m long. Assume it started from rest. The moment of inertia of a sphere is given by I= (2/5)MR2
(a) Calculate the linear speed of the sphere when it reaches the bottom of the incline. (b) Determine the angular speed of the sphere at the bottom of the incline. (c) Does the linear speed depend on the radius or mass of the sphere? Does the angular speed depend on the radius or mass of the sphere?
Magnetic Field of a Long Wire: A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current
A. points directly away from you. B. points to the left. C. circles the wire in a clockwise direction. D. circles the wire in a counter-clockwise direction.