What is the mass, in kilograms, of an avogadro's number of people, if the average mass of a person is 170 lb ?

What is the length x of the side of the triangle below? (Hint: Use the cosine function.)

Dimas [21]

Answer

The correct answer is A.

Explanation

The given triangle is a right triangle.

The length of the hypotenuse is $2.5$ units.

The given angle is $39\degree$ .

The unknown side $x$ is adjacent to the given angle.

We can therefore use the cosine function to find $x$ .

Recall the mnemonics CAH.

This means that;

$\cos\theta=\frac{Adjacent}{Hypotenuse}$

This implies that,

$\cos39\degree=\frac{x}{2.5}$

We multiply both sides by $2.5$ to get,

$2.5\cos39\degree=x$

$x=2.5(0.7771)$

We evaluate to get

$x=1.94$

Therefore the length $x$ of the side of the triangle is $1.9$ units to the nearest tenth.

7 0

3 years ago

If an electrostatically charged object is placed near other objects what will occur

bazaltina [42]

If an electrostatically charged object is placed near other objects, it would be attracted to objects with an opposite charge.

4 0

3 years ago

Sally and Suzy are moving into their first college dorm together. They are loading all their furniture onto a truck with a ramp

Ksenya-84 [330]

Answer:

B

Explanation:

Formula

Mechanical advantage = length of the ramp / height

Givens

Length of the ramp = 8

Mechanical advantage = 2

height = ?

Solution

2 = 8feet / height Multiply both sides by height

2* height = 8 feet * height / height Combine

2* height = 8 feet Divide by 2

2*height/2 = 8 feet/2

height = 4 feet.

6 0

3 years ago

according to Bob, on earth, it is 20 ly to planet y. anna has just passed earth, moving at constant speed v in a spaceship. when

eduard

Answer:

300000 KM/Sec

Explanation:

Distance between the Earth and Planet Y = 20 LY

One light year is the distance traveled when traveling at the speed of light which 300000 KM/Sec.

Anna passed the Earth traveling at speed v. After reaching planet Y, she is 20 years older than when she passed Earth. That means she took 20 years to reach planet Y. This is only possible when she traveled with the speed of light

So the velocity v = 300000 KM/Sec.

5 0

3 years ago

In principle, when you fire a rifle, the recoil should push you backward. How big a push will it give? Let's find out by doing a

MaRussiya [10]

Answer:

$v= \frac{10\times10^{-3} V}{70}$ m/s

Explanation:

Assumption: bullet leaves the muzzle at a speed of V m/s

and velocity of push received by the man be v m/s

According to newton's third law to every action there is always an equal and opposite reaction.

therefore,

mass of man× velocity = mass of bullet×its velocity

⇒70×v= 10×10^-3 ×V

solving the above eqaution we get

therefore $v= \frac{10\times10^{-3} V}{70}$ m/s

7 0

3 years ago