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3 years ago

A characteristic common to waves is that they

Physics

1 answer:

inn [45]3 years ago

5 0

This is mr day and infact am seeing this… come into my office after class.

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A weightlifter curls a 30 kg bar, raising it each time a distance of 0.50 m .How many times must he repeat this exercise to burn

ludmilkaskok [199]

Answer:

$N = 2141 times$

Explanation:

Each time the work done to raise a given mass is

$W = mgh$

here we know that

$m = 30 kg$

$h = 0.50 m$

now we have

$W = (30 kg)(9.81 m/s^2)(0.50)$

$W = 147.15 J$

since it is just 25% of actual energy consumed as we know its efficiency is 25%

so we have total energy consumed in this way

$E_{total} = \frac{147.15}{0.25}$

$E_{total} = 588.6 J$

now if it took N number of times so burn the fat of a pizza then

$N(588.6) = 1260 \times 10^3$

$N = 2141 times$

4 0

3 years ago

A wheelchair moves upward on a 7.1 degree ramp at a speed of 20km/h what is the horizontal velocity

Charra [1.4K]

Answer:

If the wheelchair is up 7.1 ft. In hight the time of flight should be 0.664 seconds and the distance should be 12.108 ft.

Explanation: I divided the displacement by the time and I used the equation Vx = 20 km/m

6 0

3 years ago

1. A plane mirror has a surface

kenny6666 [7]

Answer:

A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).

3 0

3 years ago

Read 2 more answers

What causes the tail of a comet to become visible?

nlexa [21]

Answer:

The correct answer is option C. Sun.

Explanation:

The tail of a comet as well as the comma are visible thanks to the influence of sunlight on these objects.

If there is a case that these objects cross the inner Solar System, then they will be visible from Earth. The reason why this occurs is that as the comet approaches the internal solar system, the materials that are inside the comet vaporize and flow out of the nucleus thanks to solar radiation, and while they do carry dust with them.

This dust is the one that reflects sunlight directly, while the gases shine because of ionization.

Usually we will need a telescope to see a comet, although there are some that can be seen with the naked eye.

5 0

4 years ago

Read 2 more answers

Two balls have the same mass of 5.00 kg. Suppose that these two balls are attached to a rigid massless rod of length 2L, where L

olga_2 [115]

Answer:

Explanation:

Given

mass of balls $m= 5 kg$