A weightlifter takes 0.5s to raise a barbell with 2 free-weights from the ground to a height of 0.9m. If each free-weight has a
1 answer:
Answer:
P = 1412.82 [Watt]
Explanation:
First we must calculate the total mass that makes up the barbell and the two free weights at each end of the barbell.
Weight is now defined as the product of mass by gravitational acceleration.
where:
m = mass = 80 [kg]
g = gravity acceleration = 9.81 [m/s²]
Now using the product of the weight by the distance traveled we can calculate the work.
where:
W = work [J]
w = weight = 784.8 [N]
d = distance = 0.9 [m]
And power is defined as the relationship of work at a certain time. The potency is expressed by means of the following formula.
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Answer:
Your friend is 2.143 blocks from the restaurant.
You are 2.857 blocks from the restaurant.
Explanation:
Let t be the time both you and your friend take to walk to the restaurant.
The distance (m) from your building to the restaurant is your walking time t times your speed v1
Similarly the distance (m) from your friend building to the restaurant:
Let b be the length (in m) of a block, the total distance of 5 blocks is 5b
So your friend are 2.143b meters from the restaurant, since each block is b meters long, 2.143b meters would equals to 2.143b/b = 2.143 blocks. And you are 5 - 2.143 = 2.857 blocks from the restaurant.