a rocket takes off from Earth's surface accelerating straight up at 47.2 miles per second calculate the normal force( in N) acting on an astronaut of mass 88.9 kg, including her space suit. ( assume the rocket initial motion parallel to the +y- direction. Indicate the direction with the sign of your answer.)

Match the atomic particles with their characteristics. 1. made of two protons and two neutrons neutron 2. similar to an electron; positive charge neutrino 3. orbits nucleus; negative charge positron 4. bundle of energy; zero charge proton 5. found in nucleus; positive charge meson 6. very unstable; +, -, or zero charge gamma 7. found in nucleus; zero charge electron 8. negative particle; negative charge beta 9. atomic energy converted to mass alpha

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

The slope of a velocity time graph over any interval of time gives the during that interval