A police man hidden at an intersection observes a car that ignores a stop sign, crosses the intersection and continues at a constant speed. police man starts off 2.0s after the car, accelerates at 6.2m/s2 until the speed is 110Km/h ,then continues at this speed until he catches up with the car 1.4km from the intersection. How fast was the car traveling?

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

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)