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creativ13 [48]
3 years ago
9

How long will it take a fired shell from a cliff at an initial velocity of 800m/s at an angle 30 degree below the horizontal to

reach the ground 150m below
Physics
1 answer:
zepelin [54]3 years ago
7 0

Answer:

0.373 seconds. First, calculate the initial vertical velocity of the shell. 800sin(30) = 800*0.5 = 400 m/s Now the formula for the distance traveled is d = 400 m/s * T + 0.5A T^2 Substituting known values gives.

Explanation:

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A 60kg student traveling in a 1000kg car with a constant velocity has a kinetic energy of 1.2 x 10^4 J. What is the speedometer
777dan777 [17]

Answer:

17.64 km/h

Explanation:

mass of car, m = 1000 kg

Kinetic energy of car, K = 1.2 x 10^4 J

Let the speed of car is v.

Use the formula for kinetic energy.

K = \frac{1}{2}mv^{2}

By substituting the values

1.2\times 10^{4} = \frac{1}{2}\times 1000\times v^{2}

v = 4.9 m/s

Now convert metre per second into km / h

We know that

1 km = 1000 m

1 h = 3600 second

So, v = \left (\frac{4.9}{1000}   \right )\times \left ( \frac{3600}{1} \right )

v = 17.64 km/h

Thus, the reading of speedometer is 17.64 km/h.

4 0
3 years ago
Two 1 MHz radio antennas emitting in-phase are separated by600
algol [13]

Answer:

1 km

Explanation:

d_0 = Gap between antennas = 600 m

\nu = Frequency = 1 MHz

z_1 = Distance to receiver = 2 km

c = Speed of light = 3\times 10^8\ m/s

Wavelength is given by

\lambda=\dfrac{c}{\nu}\\\Rightarrow \lambda=\dfrac{3\times 10^8}{1\times 10^6}\\\Rightarrow \lambda=300\ m

Distance to be moved is given by

D=\dfrac{z_1\lambda_0}{d_0}\\\Rightarrow D=\dfrac{2\times 300}{600}\\\Rightarrow D=1\ km

The distance to be moved is 1 km north.

6 0
3 years ago
A 75.5-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.38 x 10-2 m3 and is compl
Andreyy89

Answer:

Density of jacket will be 680.4733kg/m^3

Explanation:

We know that weight of water displaced= buoyant force=weight of man

Now volume of water displaced v=3.38\times 10^{-2}+6.42\times 10^{-2}=9.8\times 10^{-2}m^3

Density of water d=100kg/m^3

So weight of water displaced =9.8\times 10^{-2}\times 1000=98kg

So weight of jacket = 98-75 = 23 kg

We have given volume of the jacket = 3.38\times 10^{-2}m^3

So density of jacket =\frac{mass}{volume}=\frac{23}{3.38\times 10^{-2}}=680.4733kg/m^3

6 0
3 years ago
A child bounces a 48 g superball on the sidewalk. The velocity change of the superball is from 28 m/s downward to 17 m/s upward.
Aliun [14]

Answer:

F = 1.2×10⁻³ N

Explanation:

From the question,

Applying newton's second law of motion,

F = m(v-u)/t................... Equation 1

Given: F = magnitude of the average force exerted on the ball, m = mass of the ball, v = final velocity, u = initial velocity, t = time of  contact.

Note: let downward be negative and upward be positive.

Given: m = 48 g = 48/1000 = 0.048 kg, v = 17 m/s, u = -28 m/s (downward),

t = 1800 s

Substitute into equation 1

F = 0.048(17-[28])/1800

F = 1.2×10⁻³ N

7 0
3 years ago
X-rays take pictures of ______.
raketka [301]


The answer - all of the above.

X -rays are applied in many ways and for various purposes in every day life. They are defined as powerful waves of electromagnetic energy. They are able to penetrate most materials both organic and inorganic.

Their ability to penetrate organic material has made them especially useful in medicine where they can penetrate the body and reveal internal structures such as bones and organs.

In the airports, they are used for security purposes to check in luggage  bags for prohibited or dangerous items.

In  art, they are widely used by authenticators check for types of paper, materials, changes of composition and other clues to help establish authenticity of art pieces.  


3 0
3 years ago
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