It takes a bus driver 30 minutes to pick up students from four stops. the last stop is at the corner of greenstreet and route 70. the most direct route to school is north on route 70. the speed limit on it takes a bus driver 30 minutes to pick up students from four stops. the last stop is at the corner of green street and route 70. the most direct route to school is north on route 70. the speed limit on route 70 is 35 5 kph. the bus driver wants to calculate the average velocity from the last stop to school. can this be done from the information given

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Idon’t quite understand this problem