Which of the following is true of a first principle?
A) It is something that seems obviously true and needs no further examination.
B) It is something that is obviously false and needs no further examination.
C) It is something that is false but appears true without proper examination.
D) It is something that is true but needs a lot of examination to be proven true.
A
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Constant Acceleration Kinematics: A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A. 15 s B. 30 s C. 45 s D. 4.2 s
Compared to a low mass MS star, a high mass MS star has
A: lower luminosity, longer lifetime B: higher luminosity, shorter lifetime C: lower temperature, shorter lifetime D: larger radius, longer lifetime E: higher temperature, smaller radius
An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves,
which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake? A) 100 km B) 200 km C) 300 km D) 400 km E) 500 km
A block is pushed across a horizontal surface by the force shown. If the coefficient of kinetic friction between the block and the surface is 0.30, F = 20 N, ? = 30°, and M = 3.0 kg, what is the magnitude of the acceleration of the block?
a.
2.8 m/s2
b.
2.3 m/s2
c.
1.8 m/s2
d.
3.3 m/s2
e.
5.4 m/s2