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Blababa [14]
3 years ago
11

A 74.0-kg man stands on a bathroom scale inside an elevator.(a) The elevator accelerates upward from rest at a rate of 1.10 m/s2

for t1 seconds. What does the scale read during this time interval
Physics
1 answer:
____ [38]3 years ago
8 0

Answer:

806.6 N

Explanation:

Given that :

Mass (m) = 74 kg

Acceleration due to gravity (g) = 9.8 m/s²

Acceleration during interval t1 = 1.10 m/s²

Using the relation :

Normal reaction = Mass (g + acceleration at interval t1)

Normal reaction = 74(9.8 + 1.10)

Normal reaction = 74(10.9)

Normal reaction = 806.6 N

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The formula h = -16t squared + 64t squared gives the height, h, and time, t, of an object launched from the ground with a speed
padilas [110]

Answer:

<em>Details in the explanation</em>

Explanation:

<u>Vertical Launch</u>

When an object is thrown vertically in free air (no friction), it moves upwards at its maximum speed while the acceleration of gravity starts to brake it. At a given time and height, the object stops in mid-air and starts to fall back to the launching point until reaching it with the same speed it was launched.

We are given an expression for the height of an object in function of time t

h = -16t^2 + 64t

<em>Please note we have deleted the second 'squared' from the formula since it's incorrect and won't describe the motion of vertical launch.</em>

We now have to evaluate h for the following times, assuming h comes in feet

At t=1 sec

h = -16(1)^2 + 64(1)=64-16=48\ ft

The object is at a height of 48 feet

At t=2 sec

h = -16(2)^2 + 64(2)=128-64=64\ ft

The object is at a height of 64 feet. This is the maximum height the object will reach, as we'll see below

At t=3 sec

h = -16(3)^2 + 64(3)=192-144=48\ ft

The object is at a height of 48 feet. We can clearly see it's returning from the maximum height and is going down

At t=4 sec

h = -16(4)^2 + 64(4)=256-256=0\ ft

The object is at ground level and has returned to the launch point.

5 0
3 years ago
Which of the following is the SI unit used in measuring the temperature of a hot cup of coffee?
Mrac [35]
Which of the following is the Sl unit used in measuring the temperature of a hot cup of coffee ?


Answer: Kevin 

                Good luck and have a nice day! :D
4 0
3 years ago
Read 2 more answers
4. Provide an example of an isolated energy system and explain how it could be changed to create an open energy system. You may
GarryVolchara [31]
<span>Easy, take the top off your Thermos bottle filled with hot coffee. Assuming perfect insulation, that hot coffee is isolated from the environment; but when the top is opened the heat can now escape to that environment.

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.
</span>
4 0
3 years ago
Read 2 more answers
Two sound waves, from two different sources with the same frequency of 420 Hz travel in the same direction at 336 m/s. The sourc
Tresset [83]

Answer:

Pi(3.14) radians or 180º degrees

Explanation:

First of all, we need to obtain the wavelength of a wave traveling to the speed of sound and 420 Hz of frequency.

The formula is:

l=wavevelocity/frequency

where l = wavelength in meters

With current values:

l = 336 [m/s]/420[1/s] = 0.8 meters

Since a complete cycle (360º or 2pi radians) needs 0.8 meters to complete, 0.4 meters or 40 cm is just half of it, making a 180º degree phase or 3.14 radians.

8 0
3 years ago
II. IDENTIFY THE TYPE OF FORCE
uysha [10]

Answer:

Explanation:

1. Frictional force is responsible for running of car and buses on roads.

2.Gravitational force exists between astronauts in space.

3. Magnetic for is responsible to attract the iron objects using a magnet

4.Electrostatic force is responsible for fiber to stick on the skin.This force occurs due to the presence of charge.

5.When a person is pushing a trolley then object experience a normal reaction from ground.

6.Gravitational force makes the planet to move in their orbits.

4 0
3 years ago
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