There is a magnetic force on a particle. It is possible that the particle is:
a. moving in the direction of the magnetic field. b. stationary.
c. not part of a wire.
d. uncharged.
C
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Which of the following particles will repel one another?
A. a neutron and a negative ion B. a proton and an electron C. a negative ion and an electron D. a neutron and a neutron
An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no effects of air?
A) 0.50 s B) 0.88 s C) 1.1 s D) 2.5 s E) 0.54 s
The Greenland ice sheet can be one km thick. Estimate the pressure underneath the ice. (The density of ice is 918 kg/m3.)
a. 9.0 × 10^5 Pa (9 atm)
b. 2.5 × 10^6 Pa (25 atm)
c. 4.5 × 10^6 Pa (45 atm)
d. 9.0 × 10^6 Pa (90 atm)
An electron in an atom can go from a lower energy level to a higher energy level if the atom
A) emits a photon of a specific wavelength. B) absorbs a photon of a specific wavelength. C) emits several photons of a specific wavelength. D) emits a photon of any wavelength. E) absorbs a photon of any wavelength.