The scientific study of how living things are classified is called
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Hi There!
The scientific study of how living things are classified is called?
Taxonomy
Could anyone help me figure out d and e? How can you find the work of the friction when the force of friction is not given?
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Wow ! This is not simple, Shoot, and I give you a lot of credit and an extra merit badge if you're generally keeping up with it.
I scratched my head for a few minutes, and I think I've got it. Here's what I think is going on:
KE₁ = KE of the box before pushing (1/2) (m) (speed²) = 10 x 2² = 40 joules
KE₂ = KE of the box after pushing 3m (1/2) (m) (speed²) = 10 x 4² = 160 joules
The box gained (160 - 40) = 120 J of kinetic energy.
Now look at the cluttered force diagram. Cat's component of force in the direction of motion is 120N. That's the part of her force that does the work on the box. How much work does she do ?
(force) x (distance) = (120N) x (3m) = 360 joules .
Only 120 J of that energy showed up as increased kinetic energy of the box. The other 240J of her hard-earned work was consumed by friction.
Work of friction = (Friction force) x (distance)
240 J = (friction force) x (3 m)
240 J / 3 m = friction 'force' = 80 N .
I think that's it.
What I did was:
-- Find the work that Cat did.
-- Find the increase in the kinetic energy of the box.
-- The difference ... the 'missing energy' ... was the work done by friction in the same distance.
Does this do anything for you ?
Challenge: Some but not all of the gasoline used by car's enegine is transformed into kinetic energy. Where might some of the energy go in this system?
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Most of the excess energy is released as waste heat into the air surrounding the engine. Small amounts of excess energy are also released as sound energy, and as electrical energy generated by the alternator in a car's engine.
A small diameter lead ball and a large diameter rubber ball are dropped from a tower. The balls hit the ground at the same time. What conclusion can be drawn about the force of gravity?
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This demonstration doesn't tell anything about the force of gravity. But it does demonstrate that the acceleration of gravity is the same for all objects, no matter what they weigh.
What is the equivalent resistance for a parallel circuit that has two resistors: 18.0 ohms and 23.5 ohms?
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With only two resistors in parallel, it's relatively easy to calculate their combined equivalent resistance.
R = (their product) / (their sum)
= (18Ω x 23.5Ω) / (18Ω + 23.5Ω)
= (423Ω²) / (41.5Ω)
= 10.2 Ω
Form of energy that exhibits wavelength behavior as it travels through space. Example: Mircrowave rays, U.V. rays.
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That's "electromagnetic" energy. It also includes radio, heat, light, and X-rays.