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lorasvet [3.4K]
3 years ago
14

An object on a rope is lowered steadily decreasing speed. Which is true?

Physics
1 answer:
HACTEHA [7]3 years ago
4 0

Answer:

C) the rope tension is less than the objects weight

Explanation:

According to Newton's Second Law, when an unbalanced or net force is applied to a body, it produces an acceleration in the body in the direction of the net force itself.

In this scenario, we have two forces acting on the object. First is the weight of object acting downward. Second is the tension in the rope acting upwards.

Since, the object is being lowered in the direction of weight. Therefore, weight of the object must be greater than the tension in the rope. So, the net force has the downward direction and the object is lowered. Hence, the correct option is:

<u>C) the rope tension is less than the objects weight</u>

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A 51.0 g stone is attached to the bottom of a vertical spring and set vibrating. If the maximum speed of the stone is 16.0 cm/s
Nina [5.8K]

Answer:

A) 32.22 N/m b) 0.0156 m c) 4 Hz

Explanation:

Using Hooke's law;

T = 2π √m/k where m is mass of the body in kg and k is the force constant of the spring N/m and T is the period of vibration in s.

M = 51 g = 51 / 1000 in kg = 0.051kg

Make k subject of the formula

T/2π = √m / k

Square both sides

T^2 / 4π^2 = m/k

Cross multiply

K = 4 π^2 * m/T^2

K = 4 * 3.142 * 3.142 * 0.051/ 0.25^2= 32.22N/m

B) using Hooke's law;

F = k e where e is the maximum displacement of the spring from equilibrium point called amplitude

F= weight of the body = mass * acceleration due to gravity = 0.051*9.81

0.5 = 32.22 * e

e = 0.5/32.22 = 0.0156 m

C) frequency is the number of cycle completed in a second = 1 / period

F = 1 / 0.25 = 4Hz

6 0
3 years ago
How does a solenoid convert energy from one form to another?​
SIZIF [17.4K]

Answer:

A solenoid is a device comprised of a coil of wire, the housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in. More simply, a solenoid converts electrical energy into mechanical work.

Explanation:

The coil is made of many turns of tightly wound copper wire. When an electrical current flows through this wire, a strong magnetic field/flux is created.

The housing, usually made of iron or steel, surrounds the coil concentrating the magnetic field generated by the coil.

The plunger is attracted to the stop through the concentration of the magnetic field providing the mechanical force to do work.

6 0
3 years ago
(10 POINTS) I need help on a physics question please short on time
Novosadov [1.4K]

Answer:

b

Explanation:

because it has the biggest number

5 0
2 years ago
Reset Answers
Artemon [7]

Explanation:

At a height of 93 m, the gravitational potential energy is given by :

P = mgh

Where, m is the mass of a penny

We can find its mass.

m=\dfrac{P}{gh}\\\\m=\dfrac{3}{9.8\times 93}\\\\m=0.00329\ kg

We need to find how much potential energy will have transformed into kinetic energy at the half way point (46.5m). It can be calculated as :

E=mgh'\\\\E=0.00329\times 9.8\times 46.5\\\\E=1.499\ J

Hence, a penny will have transferred 1.499 J of potential energy into kinetic energy.

7 0
4 years ago
a 45 kg sled is pulled down a sidewalk with a horizontal rope. a force of 625 N is applied and the coefficient of kinetic fricti
umka2103 [35]
I dont know so pls AHHHHH
8 0
3 years ago
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