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Masteriza [31]
3 years ago
5

27. Find the acceleration of a particle moving with a con-

Physics
1 answer:
barxatty [35]3 years ago
4 0

Answer:

32 m/s²

Explanation:

Centripetal acceleration is:

a = v² / r

Given v = 8 m/s and r = 2 m:

a = (8 m/s)² / (2 m)

a = 32 m/s²

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A horizontal spring with spring constant 130 N/m is compressed 17 cm and used to launch a 2.8 kg box across a frictionless, hori
olasank [31]

Explanation:

The given data is as follows.

        k = 130 N/m,       \Delta x = 17 cm = 0.17 m   (as 1 m = 100 cm)

     mass (m) = 2.8 kg

When the spring is compressed then energy stored in it is as follows.

             Energy = \frac{1}{2}kx^{2}

Now, spring energy gets converted into kinetic energy when the box is launched.

So,    \frac{1}{2}kx^{2} = \frac{1}{2}mv^{2}

   \frac{1}{2} \times 130 \times (0.17)^{2} = \frac{1}{2} \times 2.8 \times v^{2}

          v^{2} = \frac{3.757}{2.8}

                     = 1.34

                v = 1.15 m/sec

Now,

           Frictional force = \mu \times mg

                                    = 0.15 \times 2.8 \times 9.8

                                    = 4.116 N

Also,  Kinetic energy = work done by friction

           \frac{1}{2}mv^{2} = F_{f} \times d

           \frac{1}{2} \times 2.8 \times (1.15)^{2} = 4.116 \times d

             1.8515 = 4.116 \times d

                 d = 0.449 m

Thus, we can conclude that the box slides 0.449 m across the rough surface before stopping.

8 0
3 years ago
HELP DUE IN 5 How does a battery supply energy to a circuit?
Gnoma [55]

Answer: It's C

Explanation:

3 0
2 years ago
Question 14 of 25
natali 33 [55]

the answer is sueist

Explanation:

7 0
3 years ago
Read 2 more answers
A cyclist travels at a speed of 21.6km/h.
klio [65]

Answer:

D.6.0m/s

Explanation:

5/18*21.6

=6.0m/s

3 0
2 years ago
At ground level g is 9.8m/s^2. Suppose the earth started to increase its angular velocity. How long would a day be when people o
velikii [3]
Let s = rate of rotation 
<span>Let r = radius of earth = 6,400km </span>
<span>Then solving (s^2) r = g will give the desired rate, from which length of day is inferred. </span>
<span>People would not be thrown off. They would simply move eastward in a straight line while the curved surface of earth fell away from beneath them.</span>
5 0
3 years ago
Read 2 more answers
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