PHYSICS HIGH SCHOOL

What lever has resistance between the axis (fulcrum) and the force (effort)?

Answers

Answer 1

Answer: Third class lever it has the exact resistance

Answer 2

Answer:

Answer:

second class lever

Explanation:

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Electromagnetic waves can transfer energy without which of the following?A. Medium.
B. Electric field.
C. Magnetic field.
D. Change in either a magnetic or an electric field.

Answers

The correct answer is A. Electromagnetic waves can transfer energy without a medium. Heat can be transferred through a vacuum only via radiation. Infrared waves are electromagnetic waves that does not require a medium to travel. Heat is transferred in a vacuum in the form of infrared waves.

Electromagnetic waves can transfer energy without the use of a medium. Because of this, the waves are able to be sent through a large distance of space. Each wave can be programmed with different information such as those used to communicate with the U.S Space Station.

(d) You observe someone pulling a block of mass 41 kg across a low-friction surface. While they pull a distance of 4 m in the direction of motion, the speed of the block changes from 5 m/s to 7 m/s. Calculate the magnitude of the force exerted by the person on the block.

Answers

Answer:

The magnitude of the force is 124.23 N.

Explanation:

To known the magnitude of the force is necessary to find the acceleration, that can be done by means of the equations for a a Uniformly Accelerated Motion:

$v_(f) = v_(i) + at$ (1)

Where $v_(f)$ is the final velocity, $v_(i)$ is the initial velocity, a is the acceleration and t is the time.

$a = (v_(f)-v_(i))/(t)$ (2)

$d = v_(i)t + (1)/(2)at^(2)$ (3)

By replacing (2) in equation (3) it is gotten:

$d = v_(i)t + (1)/(2)((v_(f)-v_(i))/(t))t^(2)$

$d = v_(i)t + (1)/(2)(v_(f)-v_(i))t$

$d = v_(i)t + (1)/(2)v_(f)t-(1)/(2)v_(i)t$

Therefore, by subtracting the first and third term ( $v_(i)t-(1)/(2)v_(i)t$ ⇒ $(1)/(2)v_(i)t$ ) it is got:

$d = (1)/(2)v_(f)t + (1)/(2)v_(i)t$

Applying common factor for $(1)/(2)t$ :

$d = (1)/(2)(v_(f) + v_(i))t$ (4)

Equation (4) can be rewritten in terms of t:

$t = (2d)/((v_(f) + v_(i)))$

$t = ((2)(4m))/((7m/s + 5m/s))$

$t = (8m)/(12m/s)$

$t = 0.66s$

By knowing the time is possible to determine the acceleration by means of equation (2):

$a = (7m/s-5m/s)/(0.66s)$

$a = (2m/s)/(0.66s)$

$a = 3.03m/s^(2)$

The magnitude of the force exerted by the person on the block can be determine by means of Newton's second law:

$F = ma$ (5)

$F = (41Kg)(3.03m/s^(2))$

$F = 124.23 Kg.m/s^(2)$

$F = 124.23 N$

Hence, the magnitude of the force is 124.23 N.

How does a generator work?

Answers

An electric generator is a device that converts mechanical energy obtained from an external source into electrical energy as the output.

It is important to understand that a generator does not actually ‘create’ electrical energy. Instead, it uses the mechanical energy supplied to it to force the movement of electric charges present in the wire of its windings through an external electric circuit. This flow of electric charges constitutes the output electric current supplied by the generator. This mechanism can be understood by considering the generator to be analogous to a water pump, which causes the flow of water but does not actually ‘create’ the water flowing through it.

The modern-day generator works on the principle of electromagnetic induction discovered by Michael Faraday in 1831-32. Faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field. This movement creates a voltage difference between the two ends of the wire or electrical conductor, which in turn causes the electric charges to flow, thus generating electric current.

Think back to what you learned about stress relief in this lesson. What stress-relief strategy works best for you? Why do you think it works best for you? In addition to what you listed above, which other activities (such as various aerobic exercises, yoga, or deep breathing) are, or might be, most helpful for you? Why do you think this is the case?

Answers

Answer:

Exercise: Aerobic exercises like running, swimming, or cycling can be highly effective for stress relief. Physical activity releases endorphins, which are natural mood lifters. Additionally, exercise helps reduce muscle tension and can promote better sleep, which is crucial for managing stress.

Yoga: Yoga combines physical postures, breathing exercises, and mindfulness, making it a holistic approach to stress relief. It helps improve flexibility, reduce muscle tension, and promote relaxation through deep breathing and meditation. People who prefer a mind-body connection often find yoga highly effective.

Deep Breathing: Deep breathing exercises can be done anywhere and at any time, making them a convenient stress relief technique. Controlled breathing techniques, such as diaphragmatic breathing or the 4-7-8 technique, can help calm the nervous system and reduce stress levels.

Meditation: Meditation involves focusing the mind on a particular object, thought, or activity to train attention and awareness. It can reduce stress by promoting relaxation and mindfulness. Some people find meditation to be a powerful tool for managing stress and anxiety.

Social Support: Talking to friends, family, or a therapist can provide emotional support and a safe space to vent and share feelings. Having a strong support system can help individuals cope with stress more effectively.

Time Management: Effective time management and organizational skills can reduce the feeling of being overwhelmed. Breaking tasks into smaller, manageable steps can help individuals regain a sense of control and reduce stress.

Hobbies and Creative Activities: Engaging in hobbies or creative activities like painting, writing, or playing a musical instrument can provide an outlet for self-expression and distraction from stressors.

Nature and Relaxation: Spending time in nature, whether it's a walk in the park or a weekend camping trip, can promote relaxation and reduce stress. The calming effects of natural environments are well-documented.

Explanation:

The most effective strategy for an individual often depends on their personal preferences and the specific stressors they face. For example, someone who enjoys physical activity might find exercise to be their primary stress relief method, while someone with a preference for mindfulness might benefit more from meditation or deep breathing exercises. Experimentation and self-awareness are key to finding the best stress relief strategy for each person. Additionally, a combination of multiple strategies might be the most effective approach for some individuals, depending on the complexity of their stressors.

I Hope This Is What You Wanted

Imagine that you have a rectangular swimming pool, but you have no idea how deep it is. You know that the pool has a volume of 216 m3 . You measured the dimensions of the pool and found that it is 15 m long and 6 m wide. A. Calculate the depth of the pool. Show your work.

Answers

volume of any rectangle cuboid such as a pool length*width*height
and area is length*width

Now, volume/area=height

height=216/90
height=2.4m

A 4 kg vase sits on a shelf at a height of 1.2m. How much gravitational potential energy is added tot eh base when it is lifted to a shelf of height 1.4 m?

Answers

Gravitational Potential Energy = mgh

In this case the gravitational potential energy added is that as a result of the change in height.

   = mgΔh g ≈ 9.8m/s²

   = mg(h₂ - h₁)

   = 4*9.8*(1.4 - 1.2)

   = 7.84J

GPE added = 7.84J

Answer:

7.84 J

Explanation:

Other Questions

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calculate the area that will experience a force of 6000N from liquid exerting pressure of 300Pa. 1kPa=1000Pa

How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at –9°C to water at 0°C?A. 2.48 MJ B. 2.13 MJ C. 3.26 MJ D. 3.09 MJ

Which type of water body does water move the slowest?