An actress wears a blue dress. How could you use spot lights to make the dress appear to be black?

Answers

Answer 1

Answer:

Answer:

Use a yellow (Red + Green) spotlight to make it look black.

Explanation:

The blue fabric has pigments that can absorb the red and green light. This light is incident on the fabric, therefore, there is no light left to be reflected back, so, at plain sight, the dress will look black.

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Subject: Science Why is it important to report experimental results honestly even when the results go against your hypothesis?

Answers

Because if you're not truthful about your results then the science community will never believe anything else you publish even if it's true.

The state at which one objects distance from another object is changing

Answers

Answer:

Motion

Explanation:

the state at which one objects distance from another object is changing is motion

Answer:

Motion

Explanation:

a 63 kg object needs to be lifted 7 meters in a matter of 5 seconds. approximately how much horsepower is required to achieve this task

Answers

Power is defined as the rate of doing work or the work per unit of time. The first step to solve this problem is by calculating the work which can be determined by the equation:

W = Fd

where:

F = force exerted = ma
d = distance traveled
m = mass of object
a = acceleration

Acceleration is equivalent to the gravitational constant (9.81 m/s^2) if the force exerted has a vertical direction such as lifting.

W = Fd = mad = 63(9.81)(7) = 4326.21 Joules

Now that we have work, we can calculate power.

P = W/t = 4325.21 J / 5 seconds = 865.242 J/s or watts

Convert watts to horsepower (1 hp = 745.7 watts)

P = 865.242 watts (1hp/745.7 watts) = 1.16 hp

work = mgh

power = mgh/t = 63•9.8•7/5 = 864 watts

1 HP = 746 watts

so that is 834/746 = 1.2 HP

How dose energy move through an ecosystem

Answers

Energy flows in one direction from producer to consumer to decomposer.

Organisms can be either producers or consumers in terms of energy flow through an ecosystem. Producers convert energy from the environment into carbon bonds, such as those found in the sugar glucose.

A runner runs a 1,500 m race on a circular track. The runner stops 100 m from the starting point. What are the distance and displacement traveled by the runner

Answers

The distance and displacement traveled by the runner are respectively 1400 m and 100 m.

What are distance travelled and displacement?

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The term "displacement" refers to a shift in an object's position. It is a vector quantity with a magnitude and direction. The symbol for it is an arrow pointing from the initial location to the ending place.

The runner runs a 1,500 m race on a circular track and he stops 100 m from the starting point.

hence, total distance travelled by the runner = 1500 m - 100 m = 1400 m.

The magnitude of displacement traveled by the runner = difference between initial position and final position

= 100 m.

Learn more about displacement here:

brainly.com/question/11934397

#SPJ5

Answer:

distance- 1400 m

displacement- 100 m before the finish line

Explanation:

What would the weight of an astronaut be on Saturn if his mass is 68 kg and acceleration of gravity on Saturn is 10.44 m/s2? Please explain.

Answers

Here's the part you need to know:

   (Weight of anything) =

   (the thing's mass)
times
       (acceleration of gravity in the place where the thing is) .

   Weight = (mass ) x (gravity) .

That's always true everywhere.
You should memorize it.

For the astronaut on Saturn . . .

   Weight = (mass ) x (gravity) .

   Weight = (68 kg) x (10.44 m/s²)

   = 709.92 newtons .
__________________________________

On Earth, gravity is only 9.8 m/s².
So as long as the astronaut is on Earth, his weight is only

   (68 kg) x (9.8 m/s²)

   = 666.4 newtons .

Notice that his mass is his mass ... it doesn't change
no matter where he goes.

But his weight changes in different places, because
it depends on the gravity in each place.

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