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4 years ago

How many times larger is the elephant's momentum than the momentum of a 0.033-kg tranquilizer dart fired at a speed of 350 m/s?

1 answer:

5 0

<span>Elephants Momentum Sp= EM Sp=(5400 kg (Average weight of an Asian Elephant))(4.5 m/s ( Average walking speed) ) = 24300 kg m/s Momentum of Dart: D=MD MD=(0.033 kg)(350 m/s) = 11.55 kg m/s Elephant has more momentum</span>

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Radio Waves If your favorite FM radio station broadcasts at a frequency of 104.5 MHz, what is the wavelength of the station’s si

kompoz [17]

Answer:

The wavelength of the station’s signal is 2.9 meters

The energy of a photon of the station’s electromagnetic signal is $6.9\times10^{-26}J$

Explanation:

Wavelength $\lambda$ is inversely proprtional to frequency (f) and directly proportional to velocity of the wave (v).

$\lambda=\frac{v}{f}$ (1)

But electromagnetic waves as radio signals travel at speed of light so using this on (1):

$\lambda=\frac{c}{f}=\frac{3.0\times10^{8}}{104.5\times10^{6}}\approx2.9\,m$

Albert Einstein discovered that energy of electromagnetic waves was quantized in small discrete packages of energy called photons with energy:

$E=hf=(6.6\times10^{-34})(104.5\times10^{6})\approx6.9\times10^{-26}J$

with h the Planck's constant.

6 0

3 years ago

Ned is learning about cells in science class. He drew a picture to model a cell. What can he show with his cell drawing?

ICE Princess25 [194]

Answer:I need the answer pls

Explanation:

I don't have one

3 0

3 years ago

Read 2 more answers

Two spectators at a soccer game in Montjuic Stadium see, and a moment later hear, the ball being kicked on the playing field. Th

NikAS [45]

Answer:

a) 68.943 m

b) 41.846 m

c) 80.648 m

Explanation:

Given:

Delay in time for spectator A, t₁ = 0.201 s

Delay in time for spectator B, t₂ = 0.122 s

the delay in sound heard is the due to the distance being traveled by the sound from the kicker to the spectator

thus,

a) Distance of the kicker from A,

d₁ = speed of sound × time taken

d₁ = 343 m/s × 0.201 s = 68.943 m

b) Distance of the kicker from B,

d₂ = speed of sound × time taken

d₂ = 343 m/s × 0.122 = 41.846 m

c) Since the angle between the two spectators for the player is 90°

thus, a right angles triangle is formed.

where, the distance between the spectators is the hypotenuses (s) of the so formed triangle

Therefore,

s² = d₁² + d₂²

on substituting the values, we get

s² = 68.943² + 41.846²

s² = 6504.22

s = √6504.22

s = 80.648 m

hence, the distance between the spectators is 80.648 m

3 0

3 years ago

How much heat is absorbed by a 27g iron skillet when its temperature rises from 13oC to 23oC?

solniwko [45]

The equation for heat would be q = m*Delta T* S

Where q = the heat absorbed in joules
m = mass
Delta T = change in temperature
s = specific heat capacity of the material

for iron s = 0.450

Delta T = 23 - 13 = 10 degrees Celsius

m is given as 27 grams.

q = 27 * 10 * 0.450 = 121.5 joules

You may need to round the answer depending on what the teacher is looking for.

8 0

4 years ago

During a baseball game, a batter hits a popup to a fielder a distance d m away. the acceleration of gravity is 9.8 m/s 2 . if th

s344n2d4d5 [400]

solution:

$acceleration = 9.8m/s^2 \\
t = 6.3s \\
Initial velocity (vi) = 0m/s \\ vf = at + vi\\ vf = (9.8m/s^2)(6.3s) + 0m/s \\
vf = 61.74m/s \\
if you're asking for final velocity \\ 
d = Vit + 1/2at^2 \\
d = (0m/s)(6.3s) + 1/2(9.8m/s^2)(6.3s)^2\\ d = 1/2(9.8m/s^2)(39.69s^2) d = 194.481m$

3 0

3 years ago