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4 years ago

A train travels 94 kilometers in 2 hours, and then 58 kilometers in 4 hours what is it's average speed

Physics

1 answer:

Alisiya [41]4 years ago

7 0

The answer to your question 25.333333333

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If a ball of radius 0.1 m is suspended in water, density = 997 kg/m^3, what is the volume of water displaced and the buoyant for

densk [106]

Answer:

Part A

The volume of water displaced is 4.1887902 × 10⁻³ m³

Part B

The buoyant force is approximately 40.93 N

Explanation:

From the question, we have;

The radius of the ball suspended (barely floating) in the water, r = 0.1 m

The density of the water, ρ = 997 kg/m³

Part A

The volume of the ball = The volume of a sphere = (4/3)·π·r³

∴ The volume of the ball = (4/3) × π × 0.1³ = 0.0041887902 m³ = 4.1887902 × 10⁻³ m³

Therefore;

The volume of water displaced, V = The volume of the ball = 4.1887902 × 10⁻³ m³

The volume of water displaced, V = 4.1887902 × 10⁻³ m³

Part B

The buoyant force = The weight of the water displaced = Mass of the water, m × The acceleration due to gravity, g

The buoyant force = m × g

Where;

g ≈ 9.8 m/s²

The mass of the water, m = ρ × V

∴ m = 997 kg/m³ × 4.1887902 × 10⁻³ m³ = 4.17622383 kg

The buoyant force = 4.17622383 kg × 9.8 m/s² ≈ 40.93 N.

7 0

3 years ago

Radiation heat transfer can be due to what?

riadik2000 [5.3K]

Answer: Heat transfer due to emission of electromagnetic waves is known as thermal radiation.

Explanation: Heat transfer through radiation takes place in form of electromagnetic waves mainly in the infrared region. Radiation emitted by a body is a consequence of thermal agitation of its composing molecules.

4 0

3 years ago

Read 2 more answers

What is the wavelength of an FM radio

AleksandrR [38]

V = 3.0 x 10⁸ m/s (This is the same for all types of electromagnetic waves)

f = 88.6 MHz = 8.86 x 10⁷ Hz

λ = ?

V = fλ

λ = V/f = (3 x 10⁸)/(8.86 x 10⁷)

= 3.4 m [Ans]

Hope this helps!

4 0

3 years ago

If it rains a lot and the water stays in the streets what is it called

yarga [219]

It should be Waterlogged streets

5 0

4 years ago

Read 2 more answers

An astronaut landed on a far away planet that has a sea of water. To determine the gravitational acceleration on the planet's su

sergiy2304 [10]

To solve this problem it is necessary to apply the concepts related to hydrostatic pressure or pressure due to a fluid.

Mathematically this pressure is given under the formula

$P_h = \rho g h$

Where,

$\rho$ = Density

h = Height

g = Gravitational acceleration

Rearranging in terms of g

$g = \frac{P_h}{\rho h}$

our values are given as

$P_h = 1.1 atm (\frac{101325Pa}{1atm}) = 111457.5Pa$

$\rho = 1000kg/m^3$

$h = 12.3m$

Replacing we have

$g = \frac{111457.5}{(1000)(12.3)}$

$g = 9.061m/s^2$

Therefore the gravitational acceleration on the planet's surface is $9.061m/s^2$ (Almost the gravity of the Earth)

3 0

3 years ago