What unit is used to measure the amount of energy that people get from food?

Physics

1 answer:

3241004551 [841]3 years ago

4 0

Calories... I think Hopefully It's the right answer.

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A 15-g bullet pierces a sand bag that is 48cm thick. The initial speed of the bullet is 39 m/s and it emerged from the sandbag a

Alik [6]

We can use the conservation of energy to solve this problem.

We know the bullet goes in at 39m/s and leaves with 27m/s and some energy lost. We can model this using the kinetic equation energy.

$\frac{1}{2}(0.015)(39)^2 = \frac{1}{2}(0.015)(27)^2 +U_{L}$

The "U" is the energy lost when the bullet went through the bag. Solving for U, we get:

$U= \frac{1}{2}(0.015)(39)^2- \frac{1}{2}(0.015)(27)^2= 5.94J$

Next we know the bag is 48cm thick and that F*d=W, rearranging this equation we get:

$F= \frac{W}{d} = \frac{(5.94J)}{0.48m} = 12.375N$

F = 12.375N

7 0

3 years ago

A 0.0502-kg pair of fuzzy dice is attached to the rearview mirror of a car by a short string. The car accelerates at constant ra

Sauron [17]

Answer:

a = 0.55 m/s/s

Explanation:

As the car accelerates in forward direction the string will make some angle with the vertical direction

So here horizontal component of the tension force will accelerates the dice in forward direction along with the car

Vertical component of the tension force will balance the weight of the dice

so we will have

$Tcos\theta = mg$