During the investigation of a traffic accident, police find skid marks 90 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.50 for the prevailing conditions
Estimate the speed of the car when the brakes were applied.
30. m/s
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When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to
A) 1.0 N. B) 4.0 N. C) 16 N. D) 0.25 N. E) 0.063 N.
Which of the following is the basic [and most accurate] meaning of "mass"? An object's "mass" is
A) the force exerted on it by gravity. B) the amount of inertia it contains. C) the number of atoms it contains. D) the amount [or quantity] of matter it contains.
A torsional pendulum consists of a solid disk (mass = 2.0 kg, radius = 1.0 m) suspended by a wire attached to a rigid support. The body oscillates about the support wire. If the torsion constant is 16 N?m/rad. What is the angular frequency (in rad/s)?
A. 2 B. 4 C. 6 D. 8 E. 7
Streamers above sunspots suggest ___________
a. a prominence is about to rise into the corona b. a solar flare is about to erupt c. a magnetic field d. a supergranule is about to form