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3 years ago

Assume the objects listed below have the same velocity. Which object has the most kinetic energy?

Physics

2 answers:

algol [13]3 years ago

6 0

KE = (1/2) (mass) (speed²)

If 2 objects have the same speed, then <em>the one with more mass</em> has the greater kinetic energy.

No objects are listed below, so this is as far as I can take you. Just examine the list and look for the object with the most mass.

lakkis [162]3 years ago

6 0

Answer:

The plane has the most mass

Explanation:

just answered it on E2020

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What physics principle is used in radar guns to find the speeds of tennis balls and baseballs at sporting events?

Luda [366]

<h2>Answer: Doppler effect </h2>

Explanation:

A radar gun (also known as a Doppler radar) uses the Doppler effect when measuring "return echoes" after having sent a microwave signal (a type of electromagnetic radiation).

In this context the Doppler effect consists of the change in a wave perceived frequency when the emitter of the waves, and the observer move relative to each other.

In the case of radars, a microwave signal is sent to a target (the tennis or baseball in this case) and then is reflected after "hitting" the target, so that the radar system measures this difference between the sent signal and the reflected signal.

6 0

3 years ago

NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of th

Rzqust [24]

Answer:

a) 3h 59’ b) 5,590 m/s c) 1,910 N

Explanation:

The only force acting on the satellite (neglecting the influence of any other body) is just the attractive force from Earth, which is given by the Universal Law of Gravitation:

Fg = G* ms*me / (res² (1)

where: G = 6.67* 10⁻¹¹ N.m² / kg² ms = 780 kg, me= 5.97* 10²⁴ kg, and

res = 2* 6.38* 10⁶ m (distance between the center of the Earth and the satellite).

Fg = 1,910 N (answer c)

At the same time, this force, is the centripetal force that keeps the satellite in orbit, and that can be written as follows:

Fg = ms * v² / res (2)

By definition of velocity, we can say that the constant speed at which the satellite orbits, can be expressed as the quotient between the distance travelled around the Earth once, and the time needed to do that, which is called the period of the orbit:

v = 2*π*res / T (3)

We can solve for v first, taking the right sides of (1) and (2), as follows:

G* ms*me / (res)²= ms * v² / res

v = √(G*me/r) = 5,590 m/s (answer b)

Once obtained the value of v, we can replace in (3), and solve for T:

T = 2* π*res / v = 3 h 59 min (answer a)

7 0

3 years ago

A roller coaster's velocity at the top of the hill is 10 m/s. Two seconds later it reaches the bottom of the hill with a velocit

svet-max [94.6K]

your answer is 8 m / sec²

5 0

3 years ago

Two charged concentric spheres have radii of 0.008 m and 0.018 m. The charge on the inner sphere is 3.62 10-8 C and that on the

Alekssandra [29.7K]

Answer:

The electric field is $E = 2.2625 *10^{6} \ N/C$

Explanation:

From the question we are told that

The radius of the inner sphere is $r_1 = 0.008\ m$

The radius of the outer sphere is $r _2 = 0.018 \ m$

The charge on the inner sphere is $q_1 = 3.62 *10^{-8} \ C$

The charge on the outer sphere is $q_2 = 1.62 *10^{-8} \ C$

The position from the origin is $d = 0.012 \ m$

Generally the electric field is mathematically represented as

$E = \frac{k (q_1 )}{ r^2}$

The reason for using $q_1$ for the calculation is due to the fact that the position considered is greater than the $r_1$ but less than $r_2$

Here k is the Coulomb constant with value $k = 9*10^{9} \ kg\cdot m^3\cdot s^{-4} \cdot A{-2}$

$E = \frac{9*10^9 (3.62 *10^{-8}}{0.012^2}$

$E = 2.2625 *10^{6} \ N/C$

6 0

3 years ago

Explain the formation of color in terms of reflection and absorption of light waves.

antiseptic1488 [7]

Answer:

Every object has a different density and therefore carries different properties. When rays of white light strike an object, each ray light strikes the object with different frequency and therefore is absorbed and reflected differently from the host object.

In case if all the frequencies are absorbed by the object, it turns out to be black in color. Whereas on the other hand, if it is a mix of absorption and reflection, it makes different colors based on its frequencies and other properties of the object.

6 0

3 years ago