A 1-kg ice at -20°C is taken up from the freezer. How much heat in calories is needed to melt and convert the ice into steam at 200°C?
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- An ant of mass m clings to the rim of a flywheel of radius r, as shown. The flywheel rotates clockwise on a horizontal shaft S with constant angular velocity w. rotates, the ant revolves past the stationary points I, II, III, and IV. The ant can adhere to the wheel with a force much greater than its own weight. As the wheel Ant IV > - II III It will be most difficult for the ant to adhere to the wheel as it revolves past which of the four points? 1. It will be equally difficult for the ant to adhere to the wheel at all points. W spr 2. III 1.QUESTION 3 For 3-dimensional rotational motion of an electron, the total angular momentum... depends on I and m. has a degeneracy of 21. equals ħ/1(1+ 1). none are correctA race-car starts at the 3 o’clock position and drives counterclockwise on a circular track with a radius 4 miles. a/ What distance (in miles) has the race-car traveled if the angle swept out by the race-car is: (i). 90◦ (degree)? (ii). 5 radians? b/ What is the angle measure (in radians) swept out if the race-car has traveled 4 miles counterclockwise? c/ What does it mean about the path of the car for the angle measure to be greater than 4π radians? Explain.
- 16H.W: In the Boher model of the hydrogen atom an electron moves at 2.19*10m/s in an orbit of radius 5.29*10" centered on a proton. (a)what is the centripetal force on the electron? (b)what is the number of revolutions made each second? Ans. (a)9.06*10"m/s (b = 6. 58 + 1015 1/s H.W: A ball is thrown with an initial speed voat an angle 0 below the horizontal from rooftop 44m above the ground. It lands 2sec later at a point 32m from the Vor base of the building. Find vo and 0 Ans. 0 = -37.32vo = 20. 1m/s H.W: A ball thrown up from a rooftop of height 40m lands on ground in 4s. (a)what is its maximum height above the ground? (b)what is its velocity 15m below the rooftop? Ans. (a)44.7m (b) v = -19.65 4 H.W: An object is thrown horizontally at 20m/s from a cliff top 45m above sea level. Find (a)the time to land; (b)the angle at which it hits the water; (c)the speed at which it hits the water. Ans. (a)3.03s (b)Ø = -54.73 (c)35.79m/s#7 is the one I need help on, but if you could also help me with #6 that would help a lot