When a speeding roller-coaster car is at the bottom of a loop, the magnitude of the normal force exerted on the car’s wheels due to its interaction with the track is
A. Greater than the weight of the car and its passengers.
B. Equal to the weight of the car and its passengers.
C. Less than the weight of the car and its passengers.
A. Greater than the weight of the car and its passengers.
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A crystal diffracted a beam of electrons. The crystal spacing was 0.18 nm and the maximum scattering occurred at 80.° relative to the surface normal. The electrons were directed normally onto the crystal
(a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons?
The U-tube shown is rotated about the left vertical leg at 100 rpm. The highest pressure in the U-tube is nearest:
(A) 5.6 kPa
(B) 4.2 kPa
(C) 2.2 kPa
(D) 0.8 kPa
The speed of a wave pulse on a string depends on the tension, F, in the string and the mass per unit length, ?, of the string
Tension has SI units of and the mass per unit length has SI units of What combination of F and ? must the speed of the wave be proportional to? A) F / ? B) ? / F C) D) E)
Which of the following is not one of the three major categories of galaxies?
A) irregular galaxies B) elliptical galaxies C) globular galaxies D) spiral galaxies