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Assuming the cost of energy from the electric company is $0.065/kWh. Find the cost per day of operating a lamp that draws a current of 1.45 Amp from a 110 Volt line.
The A string of a violin is 32cm long between fixed points with a fundamental frequency of 440Hz and a mass per unit length of 6.5×10-4 kg/m. What is the wave speed in string.
A hydrogen atom consists of a single proton and a single electron. Experimentally it is found that it takes 13.6eV of energy to strip the electron from the proton. calculate the size of the hydrogen atom
The output signal intensity of the transducer is 40 Watt / cm2. The echo returning from a reflector deep inside the patient is 0.025 Watt / cm2. How many dB is the ratio of output signal to echo?
You are driving north on 107th Avenue at a speed of 32.3 mph. A police car whose siren produces a sound at a frequency of 513 Hz is approaching from the opposite direction at a speed of 61 mph, At what frequency do you year the siren
A loop of 50 turns and 40cm^(2) rotates with angular velocity of 300 turns per minute normal to a magnetic field of 0.5 T
A busy chipmunk runs back and forth along a straight line of acorns that has been set out between his burrow and a nearby tree. At some instant the little creature moves by a velocity of -1.41 m/s.
a composite slab with dimensions d1 = 10.8 cm, d2 = 3.00 cm, and d3 = 14.0 cm. What are the coordinates of the center of mass of the slab
A clock has an aluminum pendulum with a period of 1.000 s at 20.7 °C. Suppose the clock is moved to a location where the average temperature is 32.2 °C. (The linear expansion coefficient for aluminum is 2.20 10-5 °C?1.)
A lamp which is 11.5 cm tall is in front of a concave mirror which has a focal length of 66.0 cm. How tall is the lamp's image if the lamp is a distance of 39.6 cm from the mirror
a spherical mirror is polished on both sides. when the concave side is used as a mirror the magnification is 3.3. what
A solenoid of radius 2.2 cm has350 turns and a length of 17 cm. Discover its inductance. Find the rate at which current should change through it to produce an emf of 75 mV.
A stroboscopic photo of a club hitting a golf ball, such as the photo shown in the figure below, was made by Harold Edgerton in 1933. find the average force exerted by the club on the ball
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