Of all the various .TYPEs of scientific measurements that are possible to make, which type of scientific measurement has given us the most information about the physical universe?
A) Spatial measurements, i.e., measurements of distance, area, and volume.
B) Spectroscopy, i.e., measurements of spectra.
C) Measurements of mass and weight.
D) Energetics, i.e., measurements of the total energy produced by various physical processes.
E) Thermometry i.e., measurements of temperature.
B
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An RC circuit with resistance R0 and capacitance C0 has a time constant ?0 . Which of the following additions to the circuit would result in the time constant doubling?
a. a capacitor with capacitance 3C0 in series with the original C0 b. a capacitor with capacitance C0 in series with the original C0 c. a capacitor with capacitance 3C0 in parallel with the original C0 d. a capacitor with capacitance C0 in parallel with the original C0
A block is pushed up a frictionless 30° incline by an applied force as shown. If F = 25 N and M = 3.0 kg, what is the magnitude of the resulting acceleration of the block?
a.
2.3 m/s2
b.
4.6 m/s2
c.
3.5 m/s2
d.
2.9 m/s2
e.
5.1 m/s2
Land/water contrasts keep:
What will be an ideal response?
The 1560-kg solid steel door to a bank vault is 2.00 m high, 1.00-m wide and 10-cm thick. One hinge is 60.0 cm down from the top on the left-hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the lower hinge?
a. 6950 N, left b. 6950 N, right c. 7640 N, left d. 7640 N, right e. 15,300 N, left