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galben [10]
3 years ago
5

(a) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward f

orce due to gravity. When the elevator is accelerating upward, which is greater, T or w
Physics
2 answers:
Katen [24]3 years ago
8 0

Answer: T is greater

Explanation:

Since the elevator is moving against gravity more work will be done on the rope

T= m(g+a)

k0ka [10]3 years ago
3 0

Answer:

T is greater when the elevator is accelerating upwards.

Explanation:

The tension in the cable is given by the formula

T = m(g+a)

Taking upwards as positive, when the elevator is accelerating upwards a is positive and and g+a is greater than g

So the tension is greater than the weight mg.

But when the elevator is accelerating downwards the, the acceleration a is negative and g +a in the equation above is less than g and as a result the Tension force T is less than the weight w.

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(1) find the density of a substance if the mass of the substance is 150kg and dimension 20mby10mby5m
Vikentia [17]

Answer:

0.15kg/m³

Explanation:

Density = mass/ volume

Given that

Mass = 150kg

Note that volume = length x breadth x height

Volume = 20 x 10 x 5

Volume = 1000m³

Density = mass ➗ volume

Density = 150kg ➗ 1000m³

Density = 0.15kg/m³

I hope this was helpful, Please mark as brainliest  

3 0
3 years ago
Joshua was driving to a friend’s house to study. During his trip, he started on pavement. At one point, he hit an ice patch on t
Tems11 [23]

Answer:

b. Friction decreased when he went from pavement to ice and then increased two more times.

Explanation:

Frictional force depends on the normal force of the surface and a friction coefficient.

F_{f} = -\mu N

Since we're talking about the same car, the value of N will remain constant whereas μ will represent the change in the frictional coefficient of the surface. Now we consider the different surfaces, cars will slide in an icy road which means that the frictional coefficient is smaller than the pavement.

After Joshua returns to the pavement road, the resulting frictional force increases and will do so one more time when he reaches the gravel road. Gravel roads have greater frictional coefficients than pavement roads which means the frictional force will increase a second time.

7 0
3 years ago
Read 2 more answers
What is shown in the diagram?
Sav [38]

Answer:

an electromagnet

Explanation:

4 0
3 years ago
A hiker is at the bottom of a canyon facing the canyon wall closest to her. She is 790.5 meters from the wall and the sound of h
tester [92]

Answer:

4.80 seconds

Explanation:

The velocity of sound is obtained from;

V= 2d/t

Where;

V= velocity of sound = 329.2 ms-1

d= distance from the wall = 790.5 m

t= time = the unknown

t= 2d/V

t= 2 × 790.5/ 329.2

t= 4.80 seconds

7 0
3 years ago
I need help with c-j !!
Tresset [83]

Answer:44

Explanation:

just add

8 0
3 years ago
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