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2 years ago

maria is holding a ball from a height of 2m that has the potential energy of 10J, calculate the mass of the ball

2 answers:

8 0

As an object falls from rest, its gravitational potential energy is converted to kinetic energy. ... Once the object hit on the ground, height is zero, therefore no potential energy at ground level. ... If a mass of 4 kg is dropped from a height of 100 meters

Serhud [2]2 years ago

4 0

5 Kg
hope this helps!

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Find your mass if a scale on earth reads 650 N when you stand on it.

netineya [11]

Weight = (mass) x (gravity)

Acceleration of gravity on Earth = 9.8 m/s²

   Weight on Earth = (mass) x (9.8 m/s²)

Divide each side by (9.8 m/s²): Mass = (weight) / (9.8 m/s²)

    Mass = (650 N) / (9.8 m/s²)

   Mass = 66.33 kg (rounded)

7 0

2 years ago

You know that you sound better when you sing in the shower. This has to do with the amplification of frequencies that correspond

luda_lava [24]

Answer:

a) L = 0.75m f₁ = 113.33 Hz , f₃ = 340 Hz, b) L=1.50m f₁ = 56.67 Hz , f₃ = 170 Hz

Explanation:

This resonant system can be simulated by a system with a closed end, the tile wall and an open end where it is being sung

In this configuration we have a node at the closed end and a belly at the open end whereby the wavelength

With 1 node λ₁ = 4 L

With 2 nodes λ₂ = 4L / 3

With 3 nodes λ₃ = 4L / 5

The general term would be λ_n= 4L / n n = 1, 3, 5, ((2n + 1)

The speed of sound is

v = λ f

f = v / λ

f = v n / 4L

Let's consider each length independently

L = 0.75 m

f₁ = 340 1/4 0.75 = 113.33 n

f₁ = 113.33 Hz

f₃ = 113.33 3

f₃ = 340 Hz

L = 1.5 m

f₁ = 340 n / 4 1.5 = 56.67 n

f₁ = 56.67 Hz

f₃ = 56.67 3

f₃ = 170 Hz

8 0

2 years ago

A diver in the pike position (legs straight, hands on ankles) usually makes only one or one-and-a-half rotations. To make two or

Korolek [52]

Answer:

from the above analysis we can say that the angular velocity in the later case is more than that of the former case. This means that the number of rotation made in the truck case is more than that made in pike position.

Explanation:

This can be explained on the basis of conservation of angular momentum.

This means the initial and the final angular velocity is conserved. Consider initial position (1)in the pike and final position in the be truck position. So there inertia's will also be different.

⇒ $I_1\omega_1 = I_2\omega_2$

$\frac{I_1}{I_2} = \frac{\omega_2}{\omega_1}$

also,

$I_1= mr_1^2$

$I_2= mr_2^2$

since, $r_2^2$

$I_2^2$

therefore,

$\omega_1^2$

So, from the above analysis we can say that the angular velocity in the later case is more than that of the former case. This means that the number of rotation made in the truck case is more than that made in pike position.

6 0

2 years ago

HELPPP<br> why is the united states considered energy rich, while japan is considered energy poor

Temka [501]

Answer:

Energy resources can be measured. They will include the fossil fuels, geothermal and hydroelectric potential, and increasingly the renewable resources. When the US list is compared to the World it is considered energy Rich. When Japan's list is compared to the world standard it considered energy poor.

A changing technology like nuclear fusion could substantially change the assessment.

Japan does not have any substantial, oil, coal, gas, deposits, while the US does.

Explanation:

6 0

2 years ago

An object of mass m has these three forces acting on it (there is no normal force, "no surface"). F1 = 1 N, F2 = 9 N, and F3 = 5

hammer [34]

Answer:

solved

Explanation:

a) F_net = (F2 - F3)i - F1 j

b) |Fnet| = sqrt( (F2 - F3)^2 + F1^2)

= sqrt( (9- 5)^2 + 1^2)

= 4.123 N

c) θ = tan^-1( (Fnet_y/Fnet_x)

= tan^-1( -1/(9-5) )

= -14.036°

7 0

2 years ago