A fully loaded, slow-moving freight elevator has a cab with a total mass of 1400 kg, which is required to travel upward 37 m in 3.6 min, starting and ending at rest. The elevator's counterweight has a mass of only 930 kg, so the elevator motor must help pull the cab upward. What average power is required of the force the motor exerts on the cab via the cable?
Answers
Answer:
789.8 W
Explanation:
mass of the cab = 1400 kg, the counter weight of the elevator = 930 kg
weight of the cab = 1400 × 9.81 where weight = mg and m is mass and g is acceleration due to gravity.
weight of the cab = 13734 N
counter weight of the elevator = 930 × 9.81 = 9123.3 N
the exerted force of the elevator = weight of the cab - counter weight of the elevator = 13734 - 9123.3 = 4610.7 N
Average power by the motor P = F × v = F × distance / time
where v is speed in m/s, and time is in seconds
P = 4610.7 × 37 / ( 3.6 × 60) = 789.80 W
where (3.6 × 60 ) is the time in seconds
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Answers
Final answer:
Energy is the capacity to do work but not to produce heat. In physics, energy can exist in various forms, including mechanical and thermal energy.
Explanation:
Energy is the capacity to do work and is an important concept in physics. In the context of this question, it is stated that energy is the capacity to do work but not to produce heat. This highlights the distinction between the two forms of energy. For example, mechanical energy can be used to perform work on an object and cause it to move, while thermal energy is associated with heat and not directly related to work. However, it's important to note that energy can be converted from one form to another, such as converting mechanical energy to thermal energy in a friction process.
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B. Sprouted bean seeds increase.
C. Sprouted bean seeds remain constant.
D. None of the above
Answers
As we go up the y-axis, the number of sproutedbean seeds increase (option B).
What is a graph?
Graph is a data chart intended to illustrate the relationship between a set (or sets) of numbers (quantities, measurements or indicative numbers) and a reference set.
In a graph, there are two axes as follows;
- Y-axis or vertical axis
- X-axis or horizontal axis
According to this question, a graph of number of sprouted bean seeds on the y-axis is plotted against temperature on the x-axis.
We can observe that as we go up the y-axis, the number of sprouted bean seeds increase.
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Answers
Answer:
listed
Explanation:
The three major difference between Pluto and the other Terrestrial planets are
1. Pluto's orbit is far from being circular. Its orbit has highest eccentricity,meaning that its distance from sun varies more than any other planet of the solar system.
2. The ratio of the size of the planet to size of moon is highest for the for Pluto. its moon Cheron is quite large which is surprising as Pluto gravitational force is not much.
3.Pluto's orbit is the most tilted orbit of the solar system.
Answers
Answer:
The initial momentum of the ball is 8 kg-m/s.
Explanation:
Given that,
Mass of the ball is 4 kg
Initial speed of the ball is 2 m/s
Force applied to the ball is 5 N for 3 seconds
It is required to find the initial momentum of the ball. Initial momentum means that the product of mass and initial velocity of the ball. It is given as :
So, the initial momentum of the ball is 8 kg-m/s.
Answers
Displacement means when you move something from its original position. Let's say you want to sit on a chair. You move the chair from where it was originally placed. That's displacement.
Answers
Answer:
The final temperature is 50.8degrees celcius
Explanation:
Pls refer to attached handwritten document
Answer: 50.63° C
Explanation:
Given
Length of heater, L = 200 mm = 0.2 m
Diameter of heater, D = 15 mm = 0.015 m
Thermal conductivity, k = 5 W/m.K
Power of the heater, q = 25 W
Temperature of the block, = 35° C
T1 = T2 + (q/kS)
S can be gotten from the relationship
S = 2πL/In(4L/D)
On substituting we have
S = (2 * 3.142 * 0.2) / In (4 * 0.2 / 0.015)
S = 1.2568 / In 53.33
S = 1.2568 / 3.98
S = 0.32 m
Proceeding to substitute into the main equation, we have
T1 = T2 + (q/kS)
T1 = 35 + (25 / 5 * 0.32)
T1 = 35 + (25 / 1.6)
T1 = 35 + 15.625
T1 = 50.63° C