A 8.2 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.43 T pointing up. During the course of 0.20 s, the field is changed to one of 0.19 T pointing down. Part A What is the average induced emf in the coil? Express your answer using two significant figures. E = 17 ΑΣΦ ? V

You start out by driving 90 miles north in 3 hours and 21 minutes, and then you stop and park for a while. Finally you drive another 52 miles north in 2 hours and 58 minutes. The average velocity for your entire trip was 17.98 miles per hour to the north. How much time did you spend parked?     1 hours 34 minutes     3 hours 9 minutes     0 hours 47 minutes     7 hours 53 minutes

A twin-engined aircraft can fly 1360 miles from city A to city B in 5 hours with the wind and make the return trip in 8 hours against the wind. What is the speed of the wind

I've been moonwalking for hours, and I'm getting tired. Explain why, as I come to a stop, my velocity is increasing while my speed is decreasing.

That's what I thought too! But the answer choices it gave were 8 m/s, 4 m/s, 2 m/s, and 6 m/s so I'm confused. I went with 8 and it was wrong.

A biologist studies a species of bacteria called FAST, her research reveals that FAST bacteria reproduced prodigiously. If a bacteria culture contains 10 FAST bacteria at time t= 0, the number of FAST bacteria in the culture later time 't' is N(t) = 10 +6t +2t2 where 't' is expressed in seconds.  How many bacteria occupy the culture a time t = 10s?  At t =11s? Calculate how many net bacteria were born during the interval between t=10 and t=11, assume no bacteria died.  Now use calculus to find the birth rate of bacteria (rate at which new bacteria get born) at time t=10s, it may help to sketch a rouch graphy of N vs 't'.

You start out by driving 176 miles north in 2 hours and 26 minutes, and then you stop and park for a while. Finally you drive another 134 miles south in 3 hours and 38 minutes. The average velocity for your entire trip was 5.54 miles per hour to the north. How much time did you spend parked? 1 hours 30 minutes 3 hours 1 minutes 0 hours 45 minutes 7 hours 34 minutes

I keep getting this wrong despite working it out many times. Can I please get some insight on the right approach? A team of astronauts is on a mission to land on and explore a large asteroid. In addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. With what minimum initial speed ?esc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? Assume that the asteroid is approximately spherical, with an average density ?=3.32×106 g/m3 and volume ?=2.40×1012 m3 . Recall that the universal gravitational constant is ?=6.67×10−11 N·m2/kg2 . Answer in m/s

Evan is just leaving his house to visit his grandma. Normally, the trip takes him 25 minutes on the freeway, going 55 mph. But tonight he’s running 5 minutes late. How fast will he need to drive on the freeway to make up the 5 minutes?Express your answer in miles per hour.

For A= î + 2j - 4k, B = -4î + 4j + k, and C = 2j - 3k, find C· (A - B).