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2 years ago

Changr 20 min in to hr

Physics

1 answer:

Rom4ik [11]2 years ago

5 0

Answer:

change 20 min into hr = <u>0.33 hr</u>

Explanation:

convert= divide the time by 60 because 60 mins make 1 hr

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What is the resistance force when you walk up an inclined plane?

erastovalidia [21]

Answer:

the resistance force is mg cos(-)

Explanation:

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3 years ago

Light is an example of something that travels in waves. Light waves come in many different varieties, and can be seen as many di

Anuta_ua [19.1K]

Answer:

Option (B)

Explanation:

Light is a form of electro-magnetic waves. This light wave has distinct range of wavelength that allows it to form different colors of light. This means that the color of the light produces depending on the amount of wavelength it comprises.

The visible light ranges from Violet to Red, and this is observed as different colors when each of these electromagnetic waves strikes our eyes at a certain angle. The violet light has the shortest wavelength of about 410 nm, where the red light has the highest wavelength of about 650 nm.

Thus, the correct answer is option (B).

6 0

3 years ago

Read 2 more answers

This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The mag

sweet-ann [11.9K]

Answer:

Explanation:

Given

coefficient of kinetic friction $(\mu _k)$ =0.34

inclination $\theta =44$

weight of block=51 N

(a) When block is moving upward friction force acts downward

thus

$Fsin\theta -W-f_r=0$

as block is moving with constant velocity thus $F_{net}$ is zero

$f_r=\mu _kN=0.34\times Fcos\theta$

$F\left ( \sin \theta -\mu \cos \theta \right )=W$

$F=\frac{51}{0.45}=113.31 N$

(b)When Block slides down the wall friction changes its direction to oppose the block

$Fsin\theta -W+f_r=0$

$F\left ( \sin \theta +\mu \cos \theta \right )=W$

$F=\frac{W}{\left ( \sin \theta +\mu \cos \theta \right )}$

$F=\frac{51}{0.939}=54.299 N$

3 0

3 years ago

Suppose a star the size of our Sun, but of mass 9.0 times as great, were rotating at a speed of 1.0 revolution every 17 days. If

Tanya [424]

Use the conservation of angular momentum; angular momentum at the beginning = angular momentum at the end
Conservation of angular momentum:
I1 w1 = I2 w2
Where I is the moment of inertia. For a sphere, I=2/5 m R^2. Substituting into the equation above we get
w2 = I1 w1 / I2 = w1 m1 R1^2 / (m2 R2^2)
w2 = w1 4 * (R1/R2)^2
= 4*(1)*(7E5/7.5)^2
= 3.48E10 revs/(17days)
= 2.04705882 x 10^9 revs/sec

4 0

3 years ago

A 2.0-kg cart collides with a 1.0-kg cart that is initially at rest on a low-friction track. After the collision, the 1.0-kg car

nikitadnepr [17]

To solve this problem we will apply the concepts related to the conservation of momentum. The momentum can be defined as the product between the mass of the object and its velocity, and the conservation of the momentum as the equality between the change of the initial momentum versus the final momentum. Mathematically, this relationship can be described as

$m_1u_1+m_2u_2 = m_1v_2+m_2v_2$

Here,

$m_{1,2}$ = Mass of each object

$u_{1,2}$ = Initial velocity of each object

$v_{1,2}$ = Final velocity of each object

According to the statement one of the bodies does not have initial velocity, therefore said term would be zero. And the equation could be rewritten as,

$m_1u_1= m_1v_2+m_2v_2$

Replacing the values respectively (The mass of your body with its respective speed we would have)

$2kg(u_1) = 2kg(0.3m/s)+1kg(0.5m/s)$

$u_1 = \frac{2kg(0.3m/s)+1kg(0.5m/s)}{2kg}$

$u_1 = 0.55m/s$

Therefore the initial velocity of the 2kg cart is 0.55m/s

4 0

2 years ago

Changr 20 min in to hr​

Changr 20 min in to hr