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3 years ago

A 900-kg giraffe runs across a field at a rate of 50 km/hr. What is the magnitude of its momentum?

2 answers:

5 0

The real answer is 45,000 because i look at this to get the answer and it wasn't on there so i guessed and i got it right.

ololo11 [35]3 years ago

3 0

Answer:

As per the statement:

A 900-kg giraffe runs across a field at a rate of 50 km/hr.

⇒ m = 900 kg and

$v=50 km/hr$

Use conversion:

$1 km/hr = \frac{5}{18} m/s$

$v = 50 \times \frac{5}{18} = \frac{250}{18} m/s$

The magnitude of its momentum is given by:

$p = mv$

where

m is the mass in kg

v is the speed in m/s

Substitute the given value we have;

$p = 900 \times \frac{250}{18} = 50 \times 250 = 12500 kg m/s$

Therefore, the magnitude of its momentum is 12500 kg m/s

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UPS charges $7 for the first pound, and $0.20 for each additional pound. FedEx charges $5 for the first pound and $0.30 for each

grigory [225]

Answer:

1. 20 pounds

2. $11

Step-by-step explanation:

To set this up, you have to use a system of equations. It would look like this, where $p$ is pounds and $t$ is total cost:

UPS: $t=7+0.20p$

FedEx: $t=5+0.30p$

In order to solve a system of equations you must either a.) graph it, or b.) set them equal to each other.

If you graph it, the answer is where the two lines intersect.

If you set them equal to each other, solve it.

I will set them equal to each other in this:

$7+0.20p=5+0.30p$

The first step in a problem like this, where there's the same variable on both sides, is to subtract the smaller variable from both sides. In this case, it is $0.20x$ . That would turn the equation into:

$7=5+0.10p$

After that, you must solve it like a regular two-step equation.

Start by subtracting 5 from both sides:

$2=0.10p$

Now, you must divide both sides by $0.10$ .

$\frac{2}{0.10}=\frac{0.10p}{0.10}$

That would give us:

$20=p$

This means that in order for the prices to be the same, the package must be 20 pounds.

Now in order to find the total cost, you must plug 20 into one of the equations. It doesn't matter which, since they both equal the same. I will plug it into the FedEx equation:

$t=5+0.30(20)$