Question

A spacecraft is measured by an observer on the ground to have a length of 53 m as it flies overhead with a speed 17 times 10^8 m/s. The spacecraft then lands and its length is again measured by the observer on the ground, this time while the spacecraft is at rest relative to him. what result does he now get for the length of the spacecraft ? 44 m 53 m 59 m 62 m 64 m The work function of a particular metal is 2.00 eV. The metal is illuminated with monochromatic light having a wavelength of 550 nm. What will be the maximum speed of the emitted electrons? 3.00 times 10^5 m/s 5.05 times 10^4 m/s 8.02 times 10^6 m/s 5.05 m/s elections will not be ejected by this wavelength An electron is positioned between two flat, parallel plates. The two plates have equal an opposite charge, are separated by 10 mm and each plate has an area of 10^-3 m^2. If the ele feels a net force of 100 nN. what is the magnitude of the charge on one plate? 0.30 nC 300 nC 0.50 mC 5.5mC 0.50C A spacecraft is measured by an observer on the ground to have a length of 53 m as it flies overhead with a speed 17 times 10^8 m/s. The spacecraft then lands and its length is again measured by the observer on the ground, this time while the spacecraft is at rest relative to him. what result does he now get for the length of the spacecraft ? 44 m 53 m 59 m 62 m 64 m The work function of a particular metal is 2.00 eV. The metal is illuminated with monochromatic light having a wavelength of 550 nm. What will be the maximum speed of the emitted electrons? 3.00 times 10^5 m/s 5.05 times 10^4 m/s 8.02 times 10^6 m/s 5.05 m/s elections will not be ejected by this wavelength An electron is positioned between two flat, parallel plates. The two plates have equal an opposite charge, are separated by 10 mm and each plate has an area of 10^-3 m^2. If the ele feels a net force of 100 nN. what is the magnitude of the charge on one plate? 0.30 nC 300 nC 0.50 mC 5.5mC 0.50C

Answer 1

-19 ヲ RE. -3 2 C.