You need to raise a heavy block by pulling it with a massless rope. You can either (a) pull the block straight up height h, or (b) pull it up a long, frictionless plane inclined at a 15∘ angle until its height has increased by h. Assume you will move the block at constant speed either way.

Answers

Answer 1

Answer:

Final answer:

In both scenarios, the work done on the heavy block is the same, as it is determined by the change in the vertical height. However, pulling the block up the inclined plane may require less force because the work is distributed over a larger distance.

Explanation:

The subject of this question is based on the concept of work and energy in physics. When you pull the heavy block straight upwards (scenario a), the work done is equal to the force times the distance, or Work = mg*h, where m is the mass of the block, g is the acceleration due to gravity, and h is the height it needs to rise. For pulling the block up the inclined plane (scenario b), the work done still equals mg*h as the vertical distance it rises is the same.

This is because, according to the principle of work and energy, the work done on an object is equal to the change in its kinetic energy. Since the speed of the block remains constant in both scenarios, the kinetic energy does not change, meaning the work done on the block is the same in both scenarios.

However, pulling the block up the inclined plane may require less force because of the larger distance over which the work is done. But the overall work is the same in both cases.

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An 89 kg person climbs up a uniform 13 kg ladder. The ladder is 5.9 m long; its lower end rests on a rough horizontal floor (static friction coefficient 0.26) while its upper end rests against a frictionless vertical wall. The angle between the ladder and the horizontal is 52◦. Let d denote the climbing person's distance from the bottom of the ladder (see the above diagram). When the person climbs too far (d > dmax), the ladder slips and falls down (kaboom!). Calculate the maximal distance dmax the person will reach before the ladder slips. The acceleration of gravity is 9.8 m/s2.

Answers

Answer:

The maximum distance the person will reach before he slip is 1.82m.

Not even close to the middle of the ladder.

Explanation:

Check attachment for solution

Consider two walls, A and B, with the same surface areas and the same temperature drops across their thicknesses. The ratio of their thermal conductivities is kA/kB=4 and the ratio of the wall thickness is LA/LB=2. The ratio of heat transfer rates through the walls qA/qB is:(a) 0.5

(b) 1

(c) 2

(d) 4

(e) 8

(f) None of them

Answers

Answer:

Explanation:

Heat transfer across the walls due to conduction is given by:

$q = -KA(\Delta T)/(L)$

where,

q = heat transfer rate

K = thermal conductivity

A = Area

ΔT = change in temperature

L = thickness

For wall A:

$q_A = -K_AA(\Delta T)/(L_A)$

For wall B:

$q_B = -K_BA(\Delta T)/(L_B)$

Because the change of temperature and area of walls are the same. Dividing both terms:

$(q_A)/(q_B) = ((K_A)/(L_A) )/((K_B)/(L_B))\n\n (q_A)/(q_B) =((K_A)/(K_B) )/((L_A)/(L_B))$

using values given in the question:

$(q_A)/(q_B) = (4)/(2)\n\n(q_A)/(q_B) = 2$

Therefore, the correct answer is:

(c) 2

How many cars can fit in a football field?

Answers

5211.6 Car can fit in a football field.

What is the dimension of football pitch?

The recommended dimensions of a football pitch are 105m x 68m, which is 7,140 sq meters.

The average length of a car is around 14.7 feet.

i.e. 1.37 sq meters

By dividing the football pitch by length of car,

= 7140/ 1.37

= 5211.6 Car

With no gaps of course.

Therefore,

In a football field 5211.6 cars can be fit without no gap.

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100 cars can fit into a football field

A monkey is sitting on a tree when it sees a hunter claiming a near by tree. The Hunter is aiming directly at the head of the monkey.The money jumps out of the tree at the exact same time the arrow is released from the hunters bow.

Assume the Hunter has perfect aim, the monkey has zero reaction time and that air resistance is negligible.

Explain wether the monkey will avoid bring struck by the arrow.

Answers

yes as the speed or velocity of gun's bullet is very higher than the monkey so struck by the arrow

Magnitude and Direction of Electric Fields??How would you do the following? A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south. What is the charge of object A? (a)1.11×10^-9 C (b)-1.11x10^-9 C (c)2.78x10^-10 C (d)-2.78x10^-10 C (e)5.75x10^12 C (f)-5.75x10^12 C

Answers

The right answer for the question that is being asked and shown above is that: "(d)-2.78x10^-10 C." A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south.

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Answers

Answer:

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Explanation:

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