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Find how much energy is required to move a 1000 kilogram object from the Earth surface to an altitude twice the Earth radius?
The distance of the lens in the human eye fromthe retina, on which the image is focused, is about 1.7 cm. what must be the focallength of the eye
a conducting spherical shell with inner radius a and outer radius b has a positive point charge q located at its
A person holds a 2.0-kg carton of milk at armslength. If the biceps muscle is attached to the forearm at a point8 cm from the elbow joint, what force must be exerted by the muscle
A parallel-plate capacitor has fixed charges +Q and -Q. The separation of the plates is then doubled. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done in doubling the plate separation from d to..
The mass (m) equals 1.02 kg is sliding on a rough horizontal surface as shown. A force F = 8.41 N is applied at an angle of 38.7 degrees. Calculate the acceleration (a) (in m/s2) of the mass on the surface if the coefficient of kinetic friction is 0...
How far from the lens should an object be placed so that its (virtual) image is at the near-point distance of 25 if the magnification is 8X
In a slow-pitch softball game, a 0.200 kg softball crossed the plate at 16.0 m/s at an angle of 45.0° below the horizontal. Determine the impulse applied to the ball
Today's terrestrial background radiation is about 50 mrem/year, mainly due to the uranium and thorium decay chains, and potassium. The earliest evidence of life on earth was about 3.5 billion years ago.
A grating has exactly 7800 lines uniformly spaced over 2.63 cm, What is the expected angle for the third-order maximum of the green line
When its coil rotates at a frequency of 230 Hz, a certain generatorhas a peak emf of 86 V. (a) What is the peak emfof the generator when its coil rotates at a frequency of 34 Hz?(b) Determine the frequency of the coil's rotation when the peak emf of ..
The top of her head is 0.12m above her eyes. What is the height of the shortest mirror in which she can see her entire image? Expalin how far above the floor should the bottom edge of the mirror be placed?
a sample containing beryllium atomic mass 9 u aluminum 27 u and an unknown element is placed in a mass spectrometer.
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