During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner’s acceleration? Show your workWeegy:
a = (v2 - v1)/t = (10 - 6)/2 = 2 m/sec/sec (average acceleration).Auto answered|Score 1|lloyde|Points 0|User:
If you ride your bike at an average speed of 4 km/h and need to travel a total distance of 28 km, how long will it take you to reach your destination? Show your work.
Time taken = Distance/Speed.
28/4 = 7 hours.Auto answered|Score 1|lena.G|Points 231|User:
A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work.Weegy:
s (distance traveled) = 1.2 m.
u (initial velocity which) = 0.
t (time) = 0.5 sec.
a (acceleration) = 10 m/s^2.
Find velocity v = s/t = 1.2/.5 = 2.4 m/sec.
then kinetic energy= 0.5mv^2.
Where m is mass, v is velocity. [
k.e. = 20.74 joules. ] Auto answered|Score 1|lena.G|Points 231|User:
As 390 g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 3.9 J/g•°C. Show your work.
As 390 g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. What is the temperature change of the milk?
The specific heat of milk is 3.9 J/g??C.
dT = 30000/(390*3.9)
= 19.72 Degs CAuto answered|Score 1|debralev143|Points 160|
Education|No Subcategories|Auto Answered|6/3/2013 6:40:47 PM