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3 years ago

Unlike acceleration and velocity, speed does not need to specify

1 answer:

4 0

Unlike acceleration and velocity, speed does not need to specify the direction of motion. Speed is a scalar quality.

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What does the phrase “constant velocity” indicate?

pickupchik [31]

The answer is C is the velocity is the same then the acceleration is also the same.

3 0

3 years ago

A jet aircraft is traveling at 260 m/s in horizontal flight. The engine takes in air at a rate of 53.3 kg/s and burns fuel at a

IrinaVladis [17]

Answer:

The thrust of the jet engine is 4188.81 N.

Explanation:

Given that,

Speed = 260 m/s

Rate in air= 53.3 kg/s

Rate of fuel = 3.63 kg/s

Relative speed = 317 m/s

We need to calculate the rate of mass change in the rocket

Using formula of rate of mass

$\dfrac{dM}{dt}=\dfrac{dM_{a}}{dt}+\dfrac{dM_{f}}{dt}$

Put the value into the formula

$\dfrac{dM}{dt}=53.3+3.63$

$\dfrac{dM}{dt}=56.93\ kg/s$

We need to calculate the thrust of the jet engine

Using formula of thrust

$T=\dfrac{dM}{dt}u-\dfrac{dM_{a}}{dt}v$

Put the value into the formula

$T=56.93\times317-53.3\times260$

$T=4188.81\ N$

Hence, The thrust of the jet engine is 4188.81 N.

7 0

3 years ago

A stuntman with a mass of 82.5 kg swings across a pool of water from a rope that is 12.0 m. At the bottom of the swing the stunt

Brilliant_brown [7]

Answer:

The stuntman will not make it

Explanation:

At the bottom of the swing, the equation of the forces acting on the stuntman is:

$T-mg = m\frac{v^2}{r}$

where:

T is the tension in the rope (upward)

mg is the weight of the man (downward), where

m = 82.5 kg is his mass

$g=9.8 m/s^2$ is the acceleration due to gravity

$m\frac{v^2}{r}$ is the centripetal force, where

v = 8.65 m/s is the speed of the man

r = 12.0 m is the radius of the circule (the length of the rope)

Solving for T, we find the tension in the rope:

$T=mg+m\frac{v^2}{r}=(82.5)(9.8)+(82.5)\frac{8.65^2}{12.0}=1322 N$

Since the rope's breaking strength is 1000 N, the stuntman will not make it.

4 0

3 years ago

Climate Change

notsponge [240]

Answer:

hope it's helpful please Like me

8 0

3 years ago

5 different energy stores

OLga [1]

Answer: There are seven main stores of energy: magnetic

internal (thermal)

chemical

kinetic

electrostatic

elastic potential

gravitational potential

Explanation: So you can have any of these

7 0

3 years ago