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A single mass m1 = 4.5 kg hangs from a spring in a motionless elevator. The spring is extended x = 15.0 cm from its unstretched length.the elevator is moving downward with a velocity of v = -3.9 m/s but accelerating upward with an acceleration of a = 3.7 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.)
What is the force the bottom spring exerts on the bottom mass?
What is the distance the upper spring is extended from its unstretched length?
What is the distance the MIDDLE spring is extended from its unstretched length?
The sun transfers energy to the earth by radiation at a rate of approximately 1.00 kW per square meter of surface. If the solar collectors were arranged in a square array, what would be the length of its sides in kilometers and in miles
A typical red blood cell subtends an angle of only 2.0×10?5rad when viewed at a person's near-point distance of 25cm, find the magnitude of the angle subtended by the red blood cell
A uniform disk with mass m = 9.27 kg and radius R = 1.42 m lies in the x-y plane and centered at the origin. What is the magnitude of the torque on the disk about the z axis due to F1
A cylindrical fishing reel has a moment of inertia of I = 6.61E-4 kg*m2 and a radius of 3.98 cm. A friction clutch in the reel exerts a restraining torque of 1.47 N*m if a fish pulls on the line. What is the force of the fish on the line
An electron orbits a proton at a radius of 5.40 10-11 m. What is the magnitude of the magnetic field at the proton due to the orbital motion of the electron
A reversible engine takes in 555 joules per second and exhausts 482 watts. how much power does it produce
assume that the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 235 mL of coffee from 25.0 ^circ rm C to 62.0 ^circ rm C.
A 2.30-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.40sin(2?t), Find the angular frequency of the driven system
A beam of blue light of wavelength 500 nm has an intensity of 170 W/m^2, How many photoelectrons are emitted from the potassium plate per second
What is the linear speed of the hoop's center of mass just as the hoop leaves the incline and rolls onto a horizontal surface
An oscillator vibrating at 1210 Hz produces a sound wave that travels through an ideal gas at 325m/s when the gas temperature is 22.0 C. What should the gas temperature be to achieve this wavelength
The coil is in a uniform magnetic field that is perpendicular to the plane of the coil. Illustrate what rate of change of the magnetic field strength will induce a current of 4.98 A in the coil?
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