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antiseptic1488 [7]
3 years ago
8

Which of the following statements best represents a comparison of the two motions shown on the graph?

Physics
1 answer:
guajiro [1.7K]3 years ago
8 0

Answer:

C. the top line represents a greater velocity

Explanation:

The graph is a distance - time graph.

The distance is on the y-axis and time is on the x - axis.

For this graph, the slope is the velocity.

  • The steeper the line, the higher the velocity or the higher the slope.
  • Since the upper line is steeper, it will have a higher slope
  • Hence a greater velocity

The lower line is not so steep and its slope is lesser compared to the upper one.

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Select the correct answer.
Nina [5.8K]

Answer:

Ос.

The spacing between particles increases.

Heat causes greater particle activity, and the particles

are farther apart.

3 0
3 years ago
A 10 kg mass stretches a spring 70 cm in equilibrium. Suppose a 2 kg mass is attached to the spring, initially displaced 25 cm b
NARA [144]

Answer:

Explanation:

1. Find spring constant k. From a free body diagram, you will get the forces on  the 10 kg mass, with a displacement d. It will be gravity pulling the mass down and the spring force pulling the mass up. The 10 kg mass is in equilibrium. The resulting equation will be:

F = m_1a = kd - m_1g = 0 => m_1g = kd => k = \frac{m_1g}{d}

2. Use the result from 1. to find the equations of motion. In general they are given by:

x(t) = Acos(\omega t + \phi), v(t) = -\omega Asin(\omega t + \phi), where ω is:\omega = \sqrt{\frac{k}{m_2}}=\sqrt{\frac{m_1g}{m_2d}}

To find the amplitude A and the phase angle Ф, use the given initial conditions:

m₂ = 2 kg, x(0) = -0.25 m, v(0) = 2m/s

-0.25 = Acos(\phi)\\2 = -\omega Asin(\phi)= -\sqrt{\frac{m_1g}{m_2d}}Asin(\phi)\\-0.24 = Asin(\phi)

Solving for Ф:

\frac{0.24}{0.25}=tan(\phi) => \phi = 0.76

Solving for A:

-0.25 = Acos(\phi) => A = -\frac{0.25}{cos(\phi)}=-0.35

The equation for x(t) is now:

x(t) = -0.35 cos(\sqrt{\frac{m_1g}{m_2d}t} +0.76)

The frequency f is given by:f = \frac{\omega}{2\pi}

The period T is given by:T = \frac{2\pi}{\omega}

8 0
3 years ago
On a frictionless plane inclined at angle 303. The box is connected via a cord of negligible mass to a box of laundered money (m
KATRIN_1 [288]

Answer:

 T = 1.73 kg

Explanation:

Let's use Newton's second law for this balance problem

We draw a coordinate system with the x axis parallel to the plane and the Y axis perpendicular

The only force we have to lay down is the weight (W)

       Wx = W sin θ

       Wy = W cos θ

       Wx = 2.0 ain 60  

       Wx = 1.73 kg

       Wy = 2.0 cos 60

       Wy = 1.0 kg

Y Axis

      N-Wy = 0

X axis

      T- Wx = 0

      T = Wx

      T = 1.73 kg

7 0
3 years ago
You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly the car in front of you (previously traveling at the same s
romanna [79]

Answer:

Part a)

a = - 8.45 m/s/s

Part b)

d = 66 m

Part c)

d = 14.16 m

Explanation:

Part a)

when car apply brakes then the friction force on the car in front of us is given as

F_f = \mu mg

here we need to find deceleration due to friction

a = \frac{F_f}{m}

a = -\mu g

a = -8.45 m/s^2

Part b)

Braking distance of the car is the distance that it move till it stops

so we will have

v_f^2 - v_i^2 = 2ad

0 - 33.4^2 = 2(-8.45)d

d = 66 m

Part c)

Since we know that average reaction time for human is 0.424 s

now we know that during reaction time our car will travel at uniform speed

so we will have

d = vt

d = (33.4) (0.424)

d = 14.16 m

4 0
3 years ago
AKS 8a - Phenomena-Based Question: Use the data and the graph to make a claim as to which person represents each letter on the g
sergeinik [125]

Answer:

,mhom

Explanation:

6 0
3 years ago
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