HW Set II page 1 of 9 PHYSICS 1401 (1) homework solutions
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1 HW Set II page 1 of When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of about 20 km (about the size of the San Francisco area). If a neutron star rotates once every second, (a) what is the speed of a particle on the star's equator and (b) what is the magnitude of the particle's centripetal acceleration? (c) If the neutron star rotates faster, do the answers to (a) and (b) increase, decrease, or remain the same?
2 HW Set II page 2 of Two highways intersect as shown in Fig At the instant shown, a police car P is 800 m from the intersection and moving at 80 km/h. Motorist M is 600 m from the intersection and moving at 60 km/h. (a) In unit-vector notation, what is the velocity of the motorist with respect to the police car? (b) For the instant shown in Fig. 4-38,how does the direction of the velocity found in (a) compare to the line of sight between the two cars? (c) If the cars maintain their velocities, do the answers to (a) and (b) change as the cars move nearer the intersection?
3 HW Set II page 3 of A 50 kg skier is pulled up a frictionless ski slope that makes an angle of 8.0 with the horizontal by holding onto a tow rope that moves parallel to the slope. Determine the magnitude of the force of the rope on the skier at an instant when (a) the rope is moving with a constant speed of 2.0 m/s and (b) the rope is moving with a speed of 2.0 m/s but that speed is increasing at a rate of 0.10 m/s 2.
4 HW Set II page 4 of A worker drags a crate across a factory floor by pulling on a rope tied to the crate (Fig ). The worker exerts a force of 450 N on the rope, which is inclined at 38 to the horizontal, and the floor exerts a horizontal force of 125 N that opposes the motion. Calculate the magnitude of the acceleration of the crate if (a) its mass is 310 kg and (b) its weight is 310 N.
5 HW Set II page 5 of Figure 5-46 shows a man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. The combined mass of man and chair is 95.0 kg. With what force magnitude must the man pull on the rope if he is to rise (a) with a constant velocity and (b) with an upward acceleration of 1.30 m/s 2? (Hint: A free-body diagram can really help.) Suppose, instead, that the rope on the right extends to the ground, where it is pulled by a coworker. With what force magnitude must the co-worker pull for the man to rise (c) with a constant velocity and (d) with an upward acceleration of 1.30 m/s 2? What is the magnitude of the force on the ceiling from the pulley system in (e) part a; (f) part b; (g) part c, and (h) part d?
6 HW Set II page 6 of A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.4m/s 2. (a) If the tension in the cord is 89 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 2.4 m/s 2?
7 HW Set II page 7 of In Fig. 6-20, a 49 kg rock climber is climbing a chimney between two rock slabs. The static coefficient of friction between her shoes and the rock is 1.2; between her back and the rock it is She has reduced her push against the rock until her back and her shoes are on the verge of slipping. (a) Draw a free-body diagram of the climber. (b) What is her push against the rock? (c) What fraction of her weight is supported by the frictional force on her shoes?
8 HW Set II page 8 of In Fig. 6-32, a box of Cheerios and a box of Wheaties are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.0 N, and the magnitude of the frictional force on the Wheaties box is 4.0 N. If the magnitude of F is 12 N, what is the magnitude of the force on the Wheaties box from the Cheerios box?
9 HW Set II page 9 of The terminal speed of a sky diver is 160 km/h in the spread-eagle position and 310 km/h in the nosedive position. Assuming that the diver's drag coefficient C does not change from one position to the other, find the ratio of the effective cross-sectional area A in the slower position to that in the faster position An airplane is flying in a horizontal circle at a speed of 480 km/h. If its wings are tilted 40 to the horizontal, what is the radius of the circle in which the plane is flying? (See Fig ) Assume that the required force is provided entirely by an aerodynamic lift that is perpendicular to the wing surface.
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