6. A light ray strikes a reflective plane surface at an angle of 560 with the surface.

If a baseball's velocity is increased to four times its original velocity, by what factor does its kinetic energy increase

jeyben [28]

Answer:

16 times

Explanation:

Original

KE(i) = 1/2mv²

After increasing

KE(f) = 1/2m(4v)²

KE(f) = 8mv²

KE(f)/KE(i) = 8 x 2 = 16

8 0

2 years ago

John uses a lever to lift a load. The load weighs 480 N which is more than John can carry by himself. However, John can lift the

guajiro [1.7K]

I think it’s C I’m sorry if I’m wrong.
You got this I believe in you!

6 0

2 years ago

Read 2 more answers

A rod of very small diameter with a mass 2m and length 3L is placed along the xaxis with one end at the origin. An identical rod

rewona [7]

Answer:

coordinates of the center of mass for these two rods

( $x_{cm}$ , $y_{cm}$ )= ( $\frac{3L}{4}$ , $\frac{3L}{4}$ )cm

Explanation:

given

mass of a rod = 2m

length of the rod = 3L

mass of two rods = 2(2m) = 4m

radius = diameter/2 = $\frac{3L}{2}$

attached is the diagram and solution to the question

5 0

3 years ago

4. A light string is attatched to a heavy rope, and the whole thing is pulled tight. A wave is sent along the light string. When

ale4655 [162]

Answer:

The correct answer to the question is (A)

When it hits the heavy rope, compared to the wave on the string, the wave that propagates along the rope has the same (A) frequency

Explanation:

The speed of a wave in a string is dependent on the square root of the tension ad inversely proportional to the square root of the linear density of the string. Generally, the speed of a wave through a spring is dependent on the elastic and inertia properties of the string

$v = \sqrt{ \frac{T}{\mu } } = \sqrt{ \frac{T}{m/L } }$

Therefore if the linear density of the heavy rope is four times that of light rope the velocity is halved and since

v = f×λ therefore v/2 = f×λ/2

Therefore the wavelength is halved, however the frequency remains the same as continuity requires the frequency of the incident pulse vibration to be transmitted to the denser medium for the wave to continue as the wave is due to vibrating particles from a source for example

7 0

2 years ago

Recall that photosynthetic rates remain relatively constant in regions near the equator. Imagine that tropical environments pers

solniwko [45]

Answer:E.

a straight line sloping upward (atmospheric CO2 levels would not seasonally oscillate, but would have increased over time)

Explanation: Photosynthesis is the process through which green plants and certain other organisms make their food using carbon dioxide and water in the he presence of Sunlight.

During photosynthesis, energy conversion from light energy into chemical energy takes place.

Photosynthesis is one of the major processes that helps to eliminate and reduce the quantity of carbon dioxide in the atmosphere,it also serve to make oxygen present in the atmosphere.

8 0

2 years ago