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2 years ago

Which of the graphs describes the motion of a person who first rode her bicycle at constant speed and then rested?

Physics

1 answer:

sergeinik [125]2 years ago

5 0

Answer:

Its graph 1

Explanation:

She started at the origin and kept riding her bike until she stopped which causes the line to go staright because she's not moving.

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A 53.4 kg girl is at rest on 3.55 kg skateboard. She jumps forward at 1.32 m/s. What is the velocity of the skateboard afterword

RoseWind [281]

M = mass of the girl = 53.4 kg

m = mass of skateboard = 3.55 kg

V' = velocity of the combination of girl and skateboard before she jumps forward = 0 $\frac{m }{s}$

V = velocity of the girl forward = 1.32 $\frac{m }{s}$

v = velocity of the skateboard afterward = ?

Using conservation of momentum

(M + m) V' = MV + m v

inserting the values

(53.4 + 3.55) (0) = (53.4) (1.32) + (3.55) v

v = - 19.86 $\frac{m }{s}$

5 0

3 years ago

A block of 1 kg with a speed 1 m/s hits a spring placed horizontally as shown in the figure. If spring constant is 1000 N/m, fin

Evgen [1.6K]

Answer:

0.0316 m

Explanation:

Wok done = Energy change

Work done on the spring = Energy change of the block

Elastic Potential stored = Kinetic energy of the block

$\frac{1}{2} kx^{2} = \frac{1}{2} mv^{2}$

x = $\sqrt{v^{2}\frac{m}{k} }$

x = $\sqrt{1^{2}\frac{1}{1000} }$

x = 0.0316 m

k = spring constant

m = mass of block

v = velocity of the block

x = compression of spring

8 0

3 years ago

DedPeter [7]

Answer:

Both Electrical and Magnetic Forces take place between two charged objects

Explanation:

3 0

3 years ago

Magnetic fields exist

Effectus [21]

Answer:

Magnetic fields exist near a magnet, farther away from a magnet, and within a magnet.

So, the answer is D. All of the above.

Let me know if this helps!

6 0

3 years ago

A scientist wants to model an internal organ with connective tissue as a mass on a spring. The mass of the organ is 2.0 kg, and

vichka [17]

Answer:

Spring constant, k = 5483.11 N/m

Explanation:

It is given that,

Mass of the organ, m = 2 kg

The natural period of oscillation is, T = 0.12 s

Let k is the spring constant for the spring in the scientist's model. The period of oscillation is given by :

$T=2\pi\sqrt{\dfrac{m}{k}}$

$k=\dfrac{4\pi^2 m}{T^2}$

$k=\dfrac{4\pi^2 \times 2\ kg}{(0.12\ s)^2}$

k = 5483.11 N/m

So, the spring constant for the spring in the scientist's model is 5483.11 N/m.

5 0

3 years ago