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3 years ago

10 cm^3 of iron have a smaller

Physics

1 answer:

IRISSAK [1]3 years ago

4 0

Explanation:

Mass of iron = (7.9)(10) = 79g

Mass of wood = (115)(0.7) = 80.5g

Therefore iron has a smaller mass than the wood, which is true.

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A red rubber ball rolls down a hill from rest with an acceleration of 7.8 m/s 2 . How fast is it moving after it has traveled 5

Wittaler [7]

Answer:

8.83m

Explanation:

Given parameters:

Acceleration = 7.8m/s²

Initial velocity = 0m/s

distance covered = 5m

Unknown:

Final velocity = ?

Solution:

The equation to solve this problem with is given as;

V² = U² + 2aS

V is the final velocity

U is the initial velocity

a is the acceleration

S is the distance

Input the parameters and solve;

V² = 0² + 2 x 7.8 x 5 = 78

V = √78 = 8.83m

5 0

3 years ago

A 320-kg satellite experiences a gravitational force of 800 N. What is the radius of the satellite’s orbit? What is its altitude

Westkost [7]

Answer:

Radius of orbit = 3.992 × $10^{7}$ m

Altitude of Satellite =33541.9× m

Explanation:

Formula for gravitational force for a satellite of mass m moving in an orbit of radius r around a planet of mass M is given by;

$F= G\frac{m M}{r^{2} }$

Where G = Gravitational constant = 6.67408 × 10-11 $\frac{m^{3} }{Kg sec^{2} }$

We are given

F= 800 N

m = 320 Kg

M = 5.972 × $10^{24}$ Kg

G = 6.67408 × 10-11 $\frac{m^{3} }{Kg sec^{2} }$

We have to find radius r =?

putting values in formula;

==> 800 =6.67408 × $10^{-11}$ × 320 × 5.972 × $10^{24}$ / $r^{2}$

==> 800= 39.8576 × $10^{13}$ × 320 / $r^{2}$

==> 800 = 12754.43 × $10^{13}$ / $r^{2}$

==> $r^{2}$ = 12754.43 × $10^{13}$ /800

==> $r^{2}$ =15.94 × $10^{13}$

==> r = 3.992 × $10^{7}$ m

==> r = 39920× $10^{3}$ m

This is the distance of satellite from center of earth. To find altitude we need distance from surface of earth. So we will subtract radius of earth from this number to find altitude.

Radius of earth =6378.1 km = 6378.1 × $10^{3}$ m

Altitude = 39920× $10^{3}$ - 6378.1 ×

3 0

3 years ago

Two identical projectiles were projected at 200 km/h the first one is at an angle 60 to the horizontal while the second one is a

Setler79 [48]

Answer:

The angle that will have the most range (Goes further) <u>will be the one that is shot with 60 ° with the horizontal. </u>

Since the one that shoots with respect to the vertical, it will only reach higher. And it won't go as far as the horizontal.

Greetings.

Danna.

3 0

3 years ago

The image shows metamorphic rock.

scoundrel [369]

Answer:

extream heat and pressre split apart

8 0

3 years ago

Read 2 more answers

The Moon is about 3.8 ✕ 108 m from Earth. Traveling at the speed of light, 3.0 ✕ 108 m/s, how long does it take a laser beam to

lana66690 [7]

Hello

1) The total distance the light has to cover to go from Earth to the Moon and back is twice the distance between the Earth and the Moon:
$S=2d=2\cdot 3.8 \cdot 10^8~m =7.6 \cdot 10^8~m$

2) Given the relationship
$v= \frac{S}{t}$
where $v=3\cdot10^8~m/s$ is the speed of light, S the total distance covered calculate at point 1), and t the time, we can find the time the light needs to go from Earth to the Moon and back again:
$t= \frac{S}{v}= \frac{7.6\cdot10^8 m}{3\cdot10^8~m/s}=2.53~s$

4 0

4 years ago