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3 years ago

The linear momentum of a runner in a 100m dash is 750kg m/s. If the runners speed is 10m/s, What is his mass

Physics

1 answer:

Brilliant_brown [7]3 years ago

7 0

Answer:

The mass of the runner is 75 kg

Explanation:

Recall that the linear momentum is defined as the product of the mass of the object in motion times its velocity: P = m * v

Therefore, for our case we have;

750 kg m/s = m * 10 m/s

solving for the mass (m) we get:

m = 750/10 kg =75 kg

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The water level in a tank is 18 m above the ground. A hose is connected to the bottom of the tank, and the nozzle at the end of

Margarita [4]

Answer:

48.98623 m

Explanation:

Given;

Height of the water level above the ground = 18 m

Pressure at the water surface level = 3 atm = 3 × 101325 N/m²

Density of water = 1000 kg/m³

let the maximum rise in the water stream be 'x'

Now, By the conservation of energy at the water surface and the maximum height of the water stream

$\frac{P_1}{\rho g}+\frac{V_1^2}{2g}+h=\frac{P_2}{\rho g}+\frac{V_2^2}{2g}+x$

here,

V₁ and V₂ are the velocities at the surface level and the maximum level of water stream rise = 0 m/s

P₂ = 0 (atmospheric pressure)

on substituting the respective values, we get

$\frac{3\times101325}{1000\times9.81}+\frac{0^2}{2g}+18=\frac{0}{\rho g}+\frac{0^2}{2g}+x$

x = $\frac{3\times101325}{1000\times9.81}+18$

x = 30.98623 + 18

x = 48.98623 m

8 0

4 years ago

During fuel burn, the vertically launched Terrier-Sandhawk rocket had an acceleration of 300m/s^2 ( about 30 times free-fall acc

sertanlavr [38]

Initial launch velocity, u = 0
Acceleration, a = 300 m/s²
Duration, t = 8.0 s

The distance traveled is
h = ut + (1/2)*a*t²
= (0 m/s)*(8 s) + 0.5*(300 m/s²)*(8 s)²
= 9600 m

Answer: 9600 m

3 0

3 years ago

From hottest to coolest, the order of the spectral types of stars is _________. From hottest to coolest, the order of the spectr

Dimas [21]

Answer:

OBAFGKM

Explanation:

Most stars are classified using the Morgan-Keenan system, which consists of assigning a letter to the star depending on its temperature. The hottest stars are type O, and the coldest stars are type M. As for their color, the coldest stars tend to have red color and the hottest have blue colors.

Within each of these divisions (OBAFGKM), there is another division that are the numbers from 0 to 9: 0 is hotter and 9 colder, to get a better classification of a star.

The order of the letters of the Morgan – Keenan system classification, according to the temperatures is as follows:

O: temperatures greater than 33,000K

B: temperatures between 10,000K and 33,000K

A: temperatures between 7,500K and 10,000K

F: temperatures between 6000K and 7.500K

G: temperatures between 5,200K and 6,000K

K: temperatures between 3,700k and 5,200K

M: temperatures below 3,700 K

6 0

3 years ago

A psychological condition that can lead to poor sleep is __________.

Maksim231197 [3]

Insomnia is a condition in which the person with it has difficulty sleeping

3 0

3 years ago

A skater pushes off a wall and skates backward for a few meters before stopping.

Inessa05 [86]

Answer:

Explanation:

Newton's Third Law (Law of Action-Reaction) states:

Every action has an equal and opposite reaction and it occurs between two objects

In this scenario, the action would be the skater pushing off of the wall, therefore the reaction would be the wall pushing off of the skater since the two objects that are interacting are the wall and the skater.

6 0

2 years ago