1706964093
2022-10-04

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asked 2020-12-30

A majorette in a parade is performing some acrobatic twirlingsof her baton. Assume that the baton is a uniform rod of mass 0.120 kg and length 80.0 cm.

With a skillful move, the majorette changes the rotation ofher baton so that now it is spinning about an axis passing throughits end at the same angular velocity 3.00 rad/s as before. What is the new angularmomentum of the rod?

asked 2022-08-25

Two boats start together and race across a 60-km-wide lake and back. Boat A goes across at 60 km/h and returns at 60 km/h. Boat B goes across at 30 km/h, and its crew, realizing how far behind it is getting, returns at 90 km/h. Turnaround times are negligible, and the boat that completes the round trip first wins

asked 2022-06-09

-A noisy grinding machine in a factory produces a sound intensity of 1.00 * 10 ^ 5 * W / m2. Calculator (a) the decibel level of this machine, and (b) the new intensity level when a second, identical machine is added to the factory.

asked 2022-06-06

asked 2022-09-30

You're driving down the highway late one night at 18 m/s$\phantom{\rule{thickmathspace}{0ex}}\mathrm{m}/\mathrm{s}$ when a deer steps onto the road 40 m$\phantom{\rule{thickmathspace}{0ex}}\mathrm{m}$ in front of you. Your reaction time before stepping on the brakes is 0.50 s$\phantom{\rule{thickmathspace}{0ex}}\mathrm{s}$ , and the maximum deceleration of your car is 12 m/s2$\phantom{\rule{thickmathspace}{0ex}}\mathrm{m}/{\mathrm{s}}^{2}$ .

asked 2022-08-19

An electron enters a uniform magnetic field B = 0.23 T at an angle of 45° to the magnetic field (see accompanying figure). Determine the radius r and the pitch p (distance between loops) of the electron's helical path, assuming its speed is 3.0 x 106 m/s.

asked 2021-03-23

A 45-g piece of ice at 0 degree C is added to a sample of water at 8 degrees C. All of the ice melts and the temperature of the water decreases to 0 degree C. How many grams of water were there in the sample?