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Veseljchak [2.6K]
3 years ago
6

An object in equilibrium has three forces exerted on it. a 42 n force acts at 90° from the x-axis and a 46 n force acts at 60° f

rom the x-axis. what are the magnitude and direction of the third force? n ° (counterclockwise from the +x direction)

Physics
1 answer:
Olegator [25]3 years ago
8 0
Since the object is in equilibrium, then the sum of the forces acting on it is zero. You must do the sum of forces for the component "y" and for the component "x". From there you clear the components of the third force. Then you must find the direction and magnitude.
The result is a force of 85.01N at 74.30 degrees from the x axis. Attached solution.

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3 years ago
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What happens when there is a change in pressure at any point in a fluid
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8 0
3 years ago
Consider the 4-step staircase. All steps provide an equal elevation gain. The potential energy (PE) on the top step is 16.0 J. D
iragen [17]

Potential energy, PE = 0, 4, 8 and 12 at level 1, 2, 3, 4 respectively.

At Level 5, potential energy = 0 and Kinetic energy = 24 J.

<h3>Potential and Kinetic energy</h3>

Potential energy is the energy a body has by virtue of its position or state.

The formula for calculating the potentials energy of a body is given as:

  • Potential energy, PE = mgh

where m = mass of the body

g = acceleration due to gravity

h = height

Kinetic energy is the the energy a body has by virtue of its motion.

The formula for calculating kinetic energy of a body is given as:

  • Kinetic energy, KE = 1/2mv^2

The sum of the kinetic energy and potential energy of a body is constant.

Assume the ball has unit mass; m = 1

g = 10 m/s^2

At the top, total energy of the body = 16 + 8 = 24J

Calculating the gain in height for each step:

At Level 4, PE = 16 J

mgh = 16 J

1 × 10 × h = 16

h = 16/10

h = 1.6 m

Since there are four steps, each step will have a height increase = 1.6/4 = 0.4

At Level 1, h = 0

PE = 0 × 1 × 10

PE = 0 J

At Level 2, h = 0.4 m

PE = 0.4 × 1 × 10

PE = 4 J

At Level 3, h = 0.8 m

PE = 0.8 × 1 × 10

PE = 8 J

At Level 5, PE + KE = 24 J

Since PE = 0

KE = 24

Therefore, potential energy, PE = 0, 4, 8 and 12 at level 1, 2, 3, 4 respectively.

At Level 5, potential energy = 0 and Kinetic energy = 24 J.

Learn more about potential energy and Kinetic energy at: brainly.com/question/14427111

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3 years ago
The first moment of the total cross-sectional area taken about the neutral axis must be?
bekas [8.4K]

The first moment of the total cross sectional area taken about the neutral axis must be zero.

As with non-composite beams, the neutral axis (NA) is the location where the bending stress is zero. The location of the NA depends on the relative stiffness and size of each of the material sections.

Generally, the NA location is determined relative to the bottom surface of the beam. However, this is not mandatory, and the location can be relative to any location. If the bottom is used, then the NA axis is a distance "h"

The distance h can be determined by recalling that the stresses through the cross section must be in equilibrium.

learn more about neutral axis from here: brainly.com/question/28167877

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