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3 years ago

Is it true that an object moves in a a circle at a constant speed will also have a constant velocity ?

Physics

1 answer:

sveticcg [70]3 years ago

6 0

Answer:

true

Explanation:

because the speed at which the object is moving in the circle depends on the effort used

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Since most people who are electrocuted don’t blow up, what kills them?

r-ruslan [8.4K]

<span>They are killed mostly by heart attacks. Alternating electrical current interferes with the electrical pulses of the heart produced by the Sino-atrial node hence cause the heart to beat erratically and hence a heart attack and death to result. 7 milliamps to your heart for 3 seconds can cause it to be arrhythmic. </span>

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4 years ago

In a game of pool, the cue ball moves at a speed of 2 m/s toward the eight ball. When the cue ball hits the eight ball, the cue

Tomtit [17]

a) p₀ = 1.2 kg m / s

b) p_f = 1.2 kg m / s

c) $v_{2f}$ = 1.278 m/s

d)1.2482 = $v_{2f}$ cos θ

e) 0.2736 = $v_{2f}$ sin θ

g) θ = 12.36

<h3>What is momentum?</h3>

Momentum is the product of the mass of a particle and its velocity. Momentum is a vector quantity; i.e., it has both magnitude and direction.

According to the question,

We define a system formed by the two balls, which are isolated and the forces during the collision are internal.

Hence , the momentum is conserved

a) The momentum of the system before the collision:

$p_o = m v_1_0 + 0 p_o= 0.6 2 p_o = 1.2 kg m / s$

b) The momentum of the system after the collision, as the system is isolated, the momentum is conserved so

$p_f = 1.2 kg m / s$

d. On X axis

$p_ox$ = 1.2 kg m / s

$p_{fx}$ = m v1f cos 20 + m v2f cos θ

$p_o = p_f$

1.2 = 0.6 (-0.8) cos 20+ 0.6 $v_{2f}$ cos θ

1.2482 = $v_{2f}$ cos θ

e. On Y axis

$p_{oy} = 0$

$p_{fy}$ = m $v_{1f}$ sin 20 + m $v_{2f}$ cos θ

0 = 0.6 (-0.8) sin 20 + 0.6 $v_{2f}$ sin θ

0.2736 = $v_{2f}$ sin θ

Here,

g. we write our system of equations

0.2736 = $v_{2f}$ sin θ

1.2482 = $v_{2f}$ cos θ

0.219 = tan θ (divide)

θ = tan⁻¹ 0.21919

θ = 12.36

c. Now To find the velocity

0.2736 = $v_{2f}$ sin θ

$v_{2f}$ = 0.2736 / sin 12.36

$v_{2f}$ = 1.278 m / s

Learn more about momentum here:

brainly.com/question/4956182

#SPJ1

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2 years ago

On arrival at a vehicle collision, you observe a small fire in the engine compartment. A bystander is attempting to smother the

mina [271]

Answer:

<em>Aim at the base of the fire and use short bursts until the fire is out.</em>

Explanation:

Fire extinguishers use CO2 (Carbondioxide) as the extinguishing agent. This is because CO2 is denser than air, and does not support combustion.

Aiming at the base of the fire causes the CO2 to fall on the base of the fire, where the source of the fire is, trapping it, and preventing it from further reacting with air in a combustion reaction. Also, the short burst creates a strong wind that forces the flame to blow out.

3 0

3 years ago

What is the difference between a physical quantity and a unit

Shalnov [3]

Answer: What is the difference of physical quanity and a unit?

Explanation: If you are working science or math problems, the answer to this question is that quantity is the amount or numerical value, while the unit is the measurement. For example, if a sample contains 453 grams, the quantity is 453 while the unit is grams.

4 0

3 years ago

The temperature inside my refrigerator is about 4 degrees C. If I place a balloon in my fridge that initially has a temperature

maksim [4K]

Convert the given temperatures from celsius to kelvin since we are dealing with gas.

To convert to kelvin, add 273.15 to the temperature in celsius.

T1 = 22 + 273.15 = 295.15 k

T2 = 4 + 273.15 = 277.15 k

V1 = 0.5 L

Let's find the final volume (V2).

To solve for V2 apply Charles Law formula below:

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

5 0

1 year ago