Question

a.) Vector A is drawn on this page/screen with horizontal component 1.57 and vertical component 1.55.

Vector B is drawn on this page/screen with horizontal component 1.47 and vertical component 1.6.

The magnitude of their dot product is:

b.) An object is dropped from rest from 5.29m. How many seconds does it take to fall to the ground? (Use g=9.8m/s^2)

c.) US food labels measure food chemical energy in Calories, where 1Cal=4198J.A "healthy diet" is supposed to be something around 2000Cal a day.

Electric companies measure energy in "kiloWatt-hours" where 1kW=1W*3600s. In most residential settings, 1kW-hr costs about fifteen or twenty cents.

How many kiloWatt-hours is equivalent to 2,474 Calories?

Answer 1