Unit lb mean pound. Which equals to about 0.45 kilograms(kg) /4536 grams,while 1kg equals to about 2.2lb.
Hope it helps!
Answer:
A. 16.67 m/s
Explanation:
Speed or velocity refers to the rate of change in distance over a change in time. That is;
Speed = Distance ÷ time
Where;
Speed is in metre/seconds
Distance is in metre
Time is in seconds.
In this question, Steve throws a football 50 meters in 3 seconds. The average speed can be calculated this:
S = D/t
Where; d = 50m, t = 3s
S = 50/3
S = 16.6666666
S = 16.67m/s
this is first law of thermodynamics in which meaning of each term is given as
= change in internal energy
Q = Heat given to the system
W = work done by the system
so here we will have
∆U=Q-W , which means <u>Change in internal energy</u> in a system is equal to <u>heat given</u> added, minus <u>work</u> done by the system. the units for these variables are in <u>joule</u> .