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guapka [62]
2 years ago
11

A skier of mass 72 kg is pulled up a slope by a motor-driven cable. a. how much work is required to pull him 75 m up a 30 degree

slope (assumed frictionless) at a constant speed of 3.4 m/s
Physics
1 answer:
likoan [24]2 years ago
8 0

Answer: 26.460\times 10^3\ J

Explanation:

Given the mass of skier m=72 kg

distance traveled d=75 m

constant speed v=3.4 m/s

If speed is constant  then there must no force acting in the direction of motion

i.e. tension force must be equal to the component of weight

T=mg\sin 30^{\circ}

Work done is given by

\Rightarrow W=F\cdot d=Td\cos 0^{\circ}\\\Rightarrow W=mg\sin 30^{\circ} d=72\times 9.8\times 0.5\times 75\\\Rightarrow W=26.460\times 10^3\ J

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A round steel shaft is subjected to a concentrated moment M=1000 lbf.in at point B, which is located at distances a=8,b=9 in fro
viva [34]

Answer:

dmin = 1.4374in

Explanation:

In the question, it says slope at the support should not exceed the limit. When such a sentence is given always use the <u>maximum value of the property</u>. So here the maximum moment of inertia is used.

θ₁ = Pb(l² – b²)/6lEI

0.002 = 1000 x 8 x (142 - 82)/6 x 14 x 30 x 10⁶ x I₁

I₁ = 0.209523 in⁴

θ₂ = Pab(2l - b)/6lEI

0.002 = 1000 x 6 x 8 x (28 - 8)/6 x 14 x 30 x 10⁶ I2

I₂ = 0.190476 in⁴

<u>For design point of considerations, taking higher value of M.I, which is I₁</u>

I₁ = 0.209523 = (π/64) x d⁴

d⁴ = 4.2683

dmin = 1.4374in

3 0
3 years ago
Most stars are _____ compared to the sun.
Yuki888 [10]
Most stars are much smaller compared to the sun.
4 0
2 years ago
When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was converted into energy. Suppose anot
Softa [21]

Answer:

1.08 * 10^{14} J

Explanation:

Energy and mass are related by the famous equation developed by Albert Einstein:

E = mc^2

where m = mass and c = speed of light

This equation explains that an object with very small mass can produce a large amount of energy in reactions such as a nuclear reaction.

Hence, the energy produced by the explosion of a Plutonium bomb containing 3.6 grams of matter is:

E = 3.6 * 10^{-3} * (3 * 10^8)^2

E = 1.08 * 10^{14} J

3 0
3 years ago
How is a pareto chart different from a standard vertical bar​ graph?
Alona [7]

Answer:

A Pareto chart, named after an Italian economist, combines a bar chart with a line graph. The bar chart is different from a histogram in more than one way. For example, the vertical bars need not touch one another as per a histogram

Explanation:

5 0
3 years ago
As part of his job, Warren attends seminars where he must listen to presentations given by experts in his field. When he is list
jeka57 [31]

Answer:

Option (B)

Explanation:

In terms of communication, a receiver is usually referred to as a person who listens, reads as well as observes. In simple words, a receiver is an individual or it can be a group of individuals, to whom any type of message is being diverted. The other name for the receiver is 'audience'.

In the given condition, Warren is attending a seminar in which he is listening to the speaker, as a part of the audience. So, it can be concluded that Warren is a receiver who is receiving information or hearing the speaker.

Thus, the correct answer is option (B).

7 0
3 years ago
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