Question 1

for (a) it's correct but (b) is incorrect

An Earth satellite moves in a circular orbit 718 km above Earth's surface with a period of 98.95 min. What are (a) the speed and (b) the magnitude of the centripetal acceleration of the satellite? (a) Number i 7.5 Units m/s (b) Number 7.9 Units m/s *2A train at a constant 79.0 km/h moves east for 22.0 min, then in a direction 46.0" east of due north for 29.0 min, and then west for 32.0 min. What are the (a) magnitude and (b) angle (relative to east) of its average velocity during this trip? (a) Number 218 Units km/h (b) Number 28 26 Units (degrees)Your answer is partially correct. A rotating fan completes 1100 revolutions every minute. Consider the tip of a blade, at a radius of 16.0 cm. (a) Through what distance does the tip move in one revolution? What are (b) the tip's speed and (c) the magnitude of its acceleration? (d) What is the period of the motion? (a) Number 101 Units m (b) Number 18.5 Units m/s (c) Number 2139 Units m/s* 2 (d) Number 0.05 Units You TubeYour answer is partially correct. 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 23.0 km (about the size of a typical city). If a neutron star rotates once every 0.980 seconds, (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? (a) Number i 1.475e5 Units km/s (b) Number 9.4525 Units m/s*2 (c) Increase