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3 years ago

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How do simple machines make work easier? A. They add energy to the work. B. They change the strength or direction of a force. C.

They reduce the speed of work. D. They increase the distance of applied forces.

2 answers:

WINSTONCH [101]3 years ago

6 0

Your answer is A. They add energy to the work.

Juliette [100K]3 years ago

6 0

A would be the correct answer

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A ball on the end of a string is whirled around in a horizontal circle of radius 0.300 m. The plane of the circle is 1.00 m abov

Mamont248 [21]

Answer:

radial acceleration is 41.8 m / s²

Explanation:

The acceleration for circular motion is

a = v² / r

They also give us the X and Y position where the body falls when the rope breaks, let's write the projectile launch equations

x = vox t

y = v₀ₓ t - ½ g t2

Since the circle is horizontally the v₀ₓ is zero (v₀ₓ = 0)

x = v₀ₓ t

t = x / v₀ₓ

y = - ½ g t²

Let's replace and calculate the initial velocity on the X axis

y = - ½ g (x / vox)²

v₀ₓ = √ (g x² / 2 y)

v₀ₓ = √ [- (-9.8) 1.6² / (2 1.00)]

v₀ₓ = 3.54 m / s

This is the horizontal velocity, but since it circle is in horizontal position it is also the velocity of the body at the point of rupture.

Now we can calculate the radial acceleration

a = v² / r

a = 3.54² / 0.300

a = 41.8 m / s²

5 0

3 years ago

Why is the meteor shower is best observed after midnight?

harkovskaia [24]

Answer:

At dawn your location on earth is pointed straight in the direction of the Earth's travel in its orbit. Between midnight and dawn you are moving head-on through the location of the meteors in space, which means that you will, on average, observe more of them.

- public.nrao.edu

Explanation:

hope this helps

4 0

3 years ago

A car (m = 1302 kg) traveling along a road begins accelerating with a constant acceleration of 1.50 m/s2 in the direction of mot

antiseptic1488 [7]

First we will use the concepts of motion kinetics for which the final speed is defined as shown below,

$v_f^2=v_i^2+2as$

Here,

$v_f$ = Final velocity

$v_i$ = Initial velocity

a = Acceleration

s = Distance

Replacing,

$(35)^2 = v_i^2+2(1.5)(392)$

$v_i = 7m/s$

Using the conservation of energy for kinetic energy we have,

$KE = \frac{1}{2}mv_i^2$

$KE = \frac{1}{2}(1302)(7)^2$

$KE = 31900J$

Therefore the kinetic energy of the car is 31900J

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4 years ago

Which statement about thin lenses is correct? In each case, we are considering only a single lens. A. A diverging lens always pr

Alexus [3.1K]

Answer:

E) true. The image is always virtual and erect

Explanation:

In this exercise we are asked to find the correct statements,

for this we can use the constructor equation

1 / f = 1 / p + 1 / q

where f is the focal length, p the distance to the object and q the distance to the image

In diverging lenses, the focal length is negative and the image is virtual and erect

In convergent lenses, the positive focal length, if the object is farther than the focal length, the image is real and inverted, and if the object is at a shorter distance than the focal length, the image is virtual and straight.

With this analysis let's review each statement

A) False. The image is right

B) False. The type of image depends on where the object is with respect to the focal length

C) False. The real image is always inverted

D) False. The image is always virtual

E) true. The image is always virtual and erect

6 0

3 years ago

Which change occurs when an atom undergoes alpha decay?

oee [108]

In an alpha decay, an atom emits an alpha particle. An alpha particle consists of 2 protons and 2 neutrons: this means that during this kind of decay, the original atom loses 2 protons and 2 neutrons from its nucleus.

This also means that the atomic number Z of the element (the atomic number is the number of protons in the nucleus) decreases by 2 units in the process, while the mass number A (the mass number is the sum of the number of protons and neutrons) decreases by 4 units.

3 0

3 years ago

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