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Q. The door has a mass of 44,000 kg, the rotational inertia about a vertical axis through its huge hinges of 8.7x10^4 kg•m2, and a (front) face width of 2.4m. Neglect friction, what steady force, applied at its outer edge and perpendicular to plane of the door, can move it from rest through an angle of 90° in 30 s?
Q. Two trains, each having a speed of 34 km/h, are headed at each other on the same straight track. A bird that can fly 60km/h flies off the front of one train while they is 69 km apart and heads directly for the other train. On reaching other train it flies straight back to first train, and so forth. (We have no idea why a bird would behave in this way.) What is the total distance the bird travels before trains collide?
Light is emitted by a sodium sample that is moving toward Earth with speed v. The wavelength of the light is 589 nm in the rest frame of sample. The wavelength measured in the frame of Earth is 537 nm. Find v.
A portable 3.5 kw wate heater is immersed for 3 minutes in a plastic filled with 20 kg of water at 20C. what will be the final temperature of the mixture given specific heat of water at 4186 j/gkC.
Perform the following unit conversions for parts (A) in the table below (B) through. Show your work using a step-wise approach.
find What is the impulse delivered by the bat.
The lows note emitted by stretched string has a frequency of 50Hz.how many outcome are possible between 40Hz and 170Hz.
A 63 resistor is connected in parallel with a 115 resistor. This parallel group is connected in series with a 19 resistor. The total combination is connected across a 15 V battery.
Charges q and Q are placed on the x axis at x = 0 and x = 2.0 m, respectively. If q = -40 pC and Q = +30 pC, define the net flux through a spherical surface (radius = 1.0 m) centered on the origin.
A photoflash unit makes a very bright light for a very short time. Discuss differences in the exposure of the film with and without a flash unit. Consider the f-stop and shutter speed in your deliberation.
A small immersion heater can be used in a car to heat a cup of water for coffee or tea. suppose the manufacturer's claim of 60% efficiency.
Consider an infant who weighs 100 newtons. During each year she grows so that each dimension of her body increases by 5%. How much would she weigh then.
Consider a weathered rock or soil particle lying on a slope. How would the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope.
Two force vectors point in opposite directions and have the same magnitude. If their magnitudes are 36.5 Newton’s, then what is the magnitude of their sum?
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