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1. In an unbalanced Wheatstone bridge the potential across the galvanometer is not zero. If the galvanometer resistance is 20?, what is the galvanometer current? Take R1 = 4?, R2 = 1?, RS = 6?, RX = 3?, R = 0 ?, and V = 20V. [Hint: neglect resistor R.]
A man pulls a 50.0 kg box at constant speed across the floor. What is the value of the normal force
Two waves with identical frequency but different amplitudes A1 = 5.0 cm and A2 = 3.0 cm, What is the ratio of the largest and smallest amplitudes
water has a specific heat capacity of 4186 jkg degc. a tank contains 500 kg of water at 10.0degc. the water is heated
A laser emits light at power 1.50 mWand wavelength 633 nm. The laser beam is focused (narrowed) untilits diameter matches the 1266 nm diameter of a sphere placed in its path. What is the magnitude of the corresponding force
0.0029 J of energy are stored in a parallel-plate capacitor whose plates each have area 0.30 m2 and are 1.5 mm apart
One of two identical 500-Hz tuning forks is at rest and other is moving. These produce a beat frequency of 5 Hz. What are the possible velcities of the moving fork
Energy is transferred to a block of wood by a force at a rate given by: Compute the maximum power delivered to the block and when it occurs.
The pressure amplitude of a sound wave in air (1.29 kg/m3) at 3.0oC is 2.0 × 103 Pa. What is the displacement amplitude if the frequency is 170Hz
A woman of 61 kg is held firmly in the seat of her automobile by a lap and shoulder seat belt. Through a collision, the automobile decelerates from 59km/hr to 0km/hr in 11 seconds. What is the magnitude of the average horizontal force that the seat b..
A circular loop of radius 20.0 cm is placed in an external magnetic field of strength 0.300 T so that the plane of the loop is perpendicular to the field. The loop is pulled out of the field in0.400 s. Compute the average induced emf through this int..
A recently developed method to study brain function is to produce arapidly changing magnetic field within the brain. When thistechnique, known as TMS, is applied to the prefrontal cortex, forexample, it can reduce a person's ability to conjugate v..
a radioactive isotope has an activity of 9.32 times 104 bq initially. after 3.55 hours the activity is 6.71times104
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