At the instant a traffic light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of 2.00 m/s2
At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
(a.) 15.0 s
(b.) 225 m
(c.) 30.0 m/s
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The huge lobe radio galaxy at the center of the Virgo Supercluster is:
A) Virgo X-1. B) M-87, a giant elliptical galaxy. C) M-74, a very bright Seyfert Spiral. D) M-82, disturbed by the passage of M-81 nearby. E) the Large Magellanic Cloud, disturbed by Supernova 1987A.
When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is
a. 0. b. ?mgh. c. +mgh. d. ?2mgh. e. +2mgh.
The direction of the force on a current-carrying wire in a magnetic field is
A) in the direction opposite to the current. B) perpendicular only to the current. C) perpendicular only to the magnetic field. D) in same direction as the current. E) perpendicular to both the current and the magnetic field.
Derive an equation in the form ch = f(T, D, U?) for flow of air over a long horizontal cylinder for the temperature range 0°C to 100°C, as a basis for water in the temperature range 10°C to 40°C.
GIVEN
• Water flow over a long horizontal cylinder
• Water temperature range is 10°C < T < 40°C
FIND
• An equation in the form h c= f(T, D, U?) based
ASSUMPTIONS
• Steady state
• Temperature difference between water and the cylinder is small enough that the Prandtl number variation is negligible
• The density of water can be considered constant
SKETCH
