A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is
A) 1 m/s2.
B) 2 m/s2.
C) 5 m/s2.
D) 10 m/s2.
E) none of the above
Answer: A
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What produces the blueish haze in the middle of the Crab Nebula?
A.) It is primarily from emission lines of oxygen. B.) It is produced by smashing streams of gas. C.) It is produced by accelerated electrons. D.) It is a condensing Hydrogen cloud. E.) We don't know.
A thin-walled spherical tank has a diameter of 0.75 m and an inter-nal pressure of 20 MPa. The yield stress in tension is 920 MPa, the yield stress in shear is 475 MPa, and the factor of safety is 2.5. The modulus of elasticity is 210 GPa, Poisson’s ratio is 0.28, and maximum normal strain is 1220 3 1026. The minimum permissible thickness of the tank is approximately:
(A) 8.6 mm
(B) 9.9 mm
(C) 10.5 mm
(D) 11.1 mm
For what frequency range is the reactance of a 3.3 ?F larger than a 3.3 ? resistance where the capacitor, resistance, and a 3.3 mH inductor are in series?
What will be an ideal response?
A pipe of length L that is closed at one end and open at the other end is resonating at its fundamental frequency. Which statement about the sound is correct?
A) The wavelength is 4L and there is a displacement node at the pipe's open end. B) The wavelength is 4L and there is a displacement antinode at the pipe's open end. C) The wavelength is L and there is a displacement node at the pipe's open end. D) The wavelength is L and there is a displacement antinode at the pipe's open end.