Why does a cyclist tilt her bicycle on a curve?
What will be an ideal response?
In order to make the force of the seat normal to the seat. The seat has to provide a vertical force equal to her weight and a horizontal centripetal force that keeps her going around the curve. The resultant is inclined at an angle, and if the bicycle is tilted at that angle she will not feel a tendency to slide off the seat.
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What makes variable stars useful in determining star distances?
A. They are brighter than other stars. B. Their exact location in the H-R diagram is known. C. They are easier to spot than ordinary stars. D. Their luminosity can be determined from their pulsation period.
A particle in a 453 m-long linear particle accelerator is moving at How long does the particle accelerator appear to the particle?
A) 219 m B) 589 m C) 104 m D) 936 m
Carnot Engine: A Carnot cycle consists of
A. two adiabats and two isobars. B. two isobars and two isotherms. C. four isotherms. D. two adiabats and two isotherms. E. four adiabats.
Characteristic x-rays can be produced by bombarding targets with electrons. These x-rays occur when
a. electrons from higher shells fill the vacant lower shell b. electrons fill the vacant valence shell c. photons are emitted with energies on the order of 103 eV d. photons are emitted with wavelengths on the order of 103 nm