PHYSICS HIGH SCHOOL

Which of the following describes what needs to occur to reduce force and to do the same amount of work?The distance that the force is exerted needs to decrease.

The mass needs to be reduced.

The distance that the force is exerted needs to increase.

The mass needs to be increased.

Answers

Answer 1
Answer:

Answer:

The distance that the force is exerted need to increase

Explanation:

Work is defined as the product of the force and distance in the direction of applied force.

                                     W = Fd    ………………. (i)

Equation (i) shows that work done can be changed by changing either force or distance. If you reduce force, you have to increase distance accordingly to keep work done constant.

Answer 2
Answer: The distance that the force is exerted needs to increase

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Organisms produce their own energy or provide energy for other organisms in a food chain. Many different organisms can be found in the Amazon rainforest in South America. Organisms in this biome include a variety of trees, plants, insects, fish, birds, reptiles, and mammals. The jaguar and anaconda are among the largest predators found in the Amazon.
Humans can hear frequencies up to approximately 20,000 Hz, while dogs can hear frequencies up to around 60,000 Hz. What sound frequency would you expect to be emitted by a dog whistle, which can be heard by dogs but not by humans?
What is the mass of a falling rock if it produces a force of 147 n? F= M= A=
Every charged particle produces ?
Power is transmitted great distances at ______ voltage and ______ current. a low, medium b high, medium c high, low d low, high

Organisms that live in desert and desert-scrub biomes have developed unique adaptations that aid in their survival. The Sahara Desert takes up ten percent of the continent of Africa, and is the largest desert in the world. The species that live in the Sahara are highly adapted to survive in the extreme conditions they live in. What morphological and physiological adaptations might be seen in the organisms that live in the Sahara Desert?

Answers

Some morphological and physiological adaptations of organisms includes special storage organs of geophytes and other plants, deep root systems of trees in order to reach deep aquifers. Additionally, some plants survive by germinating quickly after the rains and before the summer heat these plants complete their life cycles.

Answer:

C. small bodies and long limbs in warm-blooded organisms, light colored fur or feathers to reflect sunlight, lack of sweat glands in many organisms, hibernation during hot months

Explanation:

Is work done if you carry a book across the room at a constant velocity?a. No, the force applied is parallel to the direction of motion.
b. Yes, the force applied is parallel to the direction of motion.
c. No, the force applied is perpendicular to the direction of motion.
d. Yes, the force applied is perpendicular to the direction of motion.

Answers

Answer:

No, the force applied is perpendicular to the direction of motion.

Explanation:

Work done is given by :

W=Fd\ cos\theta

F = force

d = displacement

\theta = angle between force and displacement

Work is positive when the force and the displacement are in same direction. Work is negative when the force and the displacement are in opposite direction. When the force and displacement are perpendicular to each other, no work is done.

If we carry a book across the room at a constant velocity, the work done is zero. This is because our weight is acting vertically downward and we are moving forward. The angle between the force and the displacement is 90. So, no work is done.

Hence, the correct option is (c) "No, the force applied is perpendicular to the direction of motion".
No.  Work is not done if you carry a book across the room
at a constant velocity?

The force applied is perpendicular to the direction of motion. (C)

Imagine that a tank is filled with water. The height of the liquid column is 7 meters and the area is 1.5square meters (m2
). What's the force of gravity acting on the column of water?
A. 73,500 N
B. 102,900 N
C. 68,600 N
D. 110,700 N

Answers

Given:

liquid column is 7 meters and the area is 1.5 square meters (m2)

Required:

force of gravity

solution:

P = F/A where P is pressure, F is force and A is area

Since P = DgH where D is density, g is gravitational acceleration and H is height

DgH = F/A

F = ADgH

Let us assume D for water is 1000kg/m3

F = (1.5m2)(1000kg/m3)(9.8m/s2)(7m)

F = 102,900N

your answer is B. 102,900 N

i just took the test

When an object is translated, its image is the same size as the pre-image.a. True
b. False

Answers

This is true. Unlike the answer above, I disagree. A translation is simply sliding the shape across a graph. It doesn't change the size, shape, or orientation- the coordinates are the only thing that change. A dilation changes the size of a shape, not a translation.
False, Because there is some cases where enlarged image needed.

A person opens a door by applying a 10-N force perpendicular to it at a distance 0.90m from the hinges.

Answers

You faded out there before asking your question. 
Here's some info that might be of interest:

Torque = (force) x (distance from the pivot) = (10 n) x (0.9 m) = 9 newton-meters

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B. Perpendicular
C. Opposite
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Answers

Good afternoon,

B. Perpendicular

I hope this helped :)

In a transverse wave, the motion of the disturbance is PERPENDICULAR to the wave motion.

Answer:
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