A motorcyclist travels along a stretch of road at a constant speed as shown in the figure. At the bottom of the hill before he travels up the second hill, what are the directions of his velocity and acceleration? Question 6 options:
A. The velocity is tangent to the right and his centripetal acceleration is upwards.

B. The velocity is down and his centripetal acceleration is to the left.

C. The velocity is up and his centripetal acceleration is to the right.

D. The velocity is tangent to the left and his centripetal acceleration is downwards.

Ateam 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 vesc 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 p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?