-- 6.5 m/s The negative sign for the final velocity means that the ball is moving
downward (the negative direction) at 1.5 s.
Practice Problems
20. Concept Check The velocity-time equation for a golf cart is
vp = (1 m/s) + (-0.5 m/s?)t
(a) What is the cart's initial velocity?
(b) What is the cart's acceleration?
21
nd has

What defines the mass number of an isotope? a. the sum of the neutrons and protons b. the sum of the neutrons and electrons c. the number of neutrons d. the number of protons

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.