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3 years ago

PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics

1 answer:

Vikentia [17]3 years ago

4 0

C it’s C

good luck

Dkdkkdisoskjska

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The specific heat of acetic acid is 2.07 J/gºC. If 1150 J of heat is

Doss [256]

Answer:

12.3 °C

Explanation:

Q=m*Cp*ΔT-->

1150=45*2.07*ΔT-->

ΔT=1150/93.15-->

ΔΤ=12.3 °C

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3 years ago

A car increases velocity from 25 m/s to 50 m/s in 5 seconds. What is the acceleration of the car?

Mars2501 [29]

Answer:

the acceleration of the car is 5m/s2

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3 years ago

A 397-N wheel comes off a moving truck and rolls without slipping along a highway. At the bottom of a hill it is rotating at 25.

AleksAgata [21]

Answer:

h = 14.4 m

Explanation:

The height can be calculated by energy conservation:

$K_{r} + K_{t} - W = E_{p}$

<u>Where</u>:

W: is the work

$E_{p}$ : is the potential energy

$K_{r}$ : is the rotational kinetic energy

$K_{t}$ : is the transitional kinetic energy

Initially, the wheel has rotational kinetic energy and translational kinetic energy, and then when stops it has potential energy.

$K_{r} + K_{t} - W = E_{p}$

$\frac{1}{2}I\omega_{0}^{2} + \frac{1}{2}mv^{2} - W = mgh$

<u>Where</u>:

I: is the moment of inertia = 0.800 mr²

ω₀: is the angular speed = 25.0 rad/s

m: is the mass = P/g = 397 N/9.81 m*s⁻² = 40.5 kg

v: is the tangential speed = ω₀r²

Now, by solving the above equation for h we have:

$h = \frac{\frac{1}{2}(I\omega_{0}^{2} + mv^{2}) - W}{mg}$

$h = \frac{\frac{1}{2}(I\omega_{0}^{2} + m(\omega_{0}*r)^{2}) - W}{mg}$

$h = \frac{\frac{1}{2}(0.800*40.5 kg*(0.600 m)^{2}*(25.0 rad/s)^{2} + 40.5 kg*(25.0 rad/s*0.600 m)^{2}) - 2500 J}{40.5 kg*9.81 m/s^{2}} = 14.4 m$

Therefore, the height is 14.4 m.

I hope it helps you!

4 0

3 years ago

A ball is moving at 4.5 m/s and has a momentum of 75 kg·m/s. What is the ball's mass?

chubhunter [2.5K]

Answer:

Mass = 16.67kg

Explanation:

Given the following data;

Velocity = 4.5m/s

Momentum = 75kgm/s

To find the mass;

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

Momentum = mass * velocity

Substituting into the equation, we have

75 = mass * 4.5

Mass = 75/4.5

Mass = 16.67kg

Therefore, the ball's mass is 16.67 kilograms.

5 0

3 years ago

When turning from your path onto a perpendicular path your speed

Liono4ka [1.6K]

Answer: 5-15MPH

Explanation: Trust me

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3 years ago