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I am Lyosha [343]

4 years ago

15

The Force Of Gravity Acting On A Childs Mass On Earth Is 490 newtons whats the childs mass

1 answer:

Flauer [41]4 years ago

3 0

Force of gravity on an object is the weight of the object and is given by mass times accerelation due to gravity. The accerelation due to gravity is the accerelation of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtns, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

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The mass of car is 1200kg. If the car is moving with tue velocity of 30m/s. How much force should be applied to stop the car in

faust18 [17]

Answer:

momentum of car=1200kg *10m/s =12000kgm/s

momentum =force * time

12000 kgm/s =force * 20s

force = 600 N

7 0

3 years ago

Some pipe organs create sounds lower than humans can hear. This ""infrasound"" can still create physical sensations. What is the

Dominik [7]

Answer: 17.59 Hz and 4.87 m

Explanation:

The fundamental frequency of the sound from an open-open pipe is given as

f= $\frac{v}{2L}$

where v= 343 m/s

L= 32 feet= $\frac{32}{3.281}$ = 9.75 m

So,

f= $\frac{343}{2*9.75}$ = 17.59 Hz

The length of open-closed tube is related to frequency by formula

f= $\frac{v}{4L}$

or L= $\frac{v}{4f}$

L= $\frac{343}{4*17.59}$

L= 4.87 m

8 0

4 years ago

Calculate the volume of 1280 kilograms of aluminium if the density is 2700kg/m3

hjlf

Answer:

0.47m3

Explanation:

Volume = Mass / Density

In this case:

Mass - 1280 kg

Density - 2700kg/m3

1280 / 2700 = 0.4740741m3

When this is rounded off ( 2 d.p ):

0.47 m3

HOPE THIS HELPED

6 0

3 years ago

What is the position at 2 seconds?

Step2247 [10]

5

If you go over 2 on the time bar, and you look for the black dot above the 2 on the bottom time bar, it would go up to 5.

8 0

4 years ago

A marathon runner runs at a steady 15 km/hr. When the runner is 7.5 km from the finish, a bird begins flying from the runner to

Whitepunk [10]

Answer:

The value is $D = 15 \ km$

Explanation:

From the question we are told that

The speed of the marathon runner is $v = 15 \ km /hr$

The distance from the distance from the finish is $d = 7.5 \ km$

The speed of the bird is $v_b = 30 \ km / hr$

Generally the time taken for the runner to reach the finish is mathematically represented as

$t = \frac{d}{v}$

$t = \frac{7.5}{15}$

$t = \frac{1}{2}$

So the distance covered by the bird is

$D = v_b * t$

$D = 30 * \frac{1}{2}$

$D = 15 \ km$

6 0

3 years ago