A 14000 N slippery hippo runs and then slides along the slippery ground. If the coefficient of kinetic friction between the hippo and the mud is 0.045, what force of friction slows down the hippo? 63 N

63 Kg

630 N

31,000 N

Which term best describes the phrase “something that happens”?

Hunter’s velocity was 4.5 m/s. at the end of his race, his velocity was the same. which best describes his movement? his movement stopped. his acceleration is zero. his time was constant. his acceleration was positive.

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b.what is the wavelength of the wave? c.what is the amplitude of the magnetic field? d.what is the intensity of the wave?