1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vladimir79 [104]
3 years ago
13

Fast Bullets A rifle with that shoots bullets at 420 m/s shoots a bullet at a target 49.8 m away. How high above the target must

the rifle barrel be pointed to ensure that the bullet will hit the target?
Physics
1 answer:
Nezavi [6.7K]3 years ago
8 0

Answer:

0.08°

Explanation:

velocity of projection, u = 420 m/s

Horizontal range, R = 49.8 m

Let the angle of projection is θ.

Use the formula for the horizontal range.

R=\frac{u^{2}Sin2\theta }{g}

49.8=\frac{420^{2}Sin2\theta }{9.8}

Sin 2θ = .0027

2θ = 0.1585

θ = 0.08°

You might be interested in
If an object absorbs all colors but red, we see
julia-pushkina [17]
[I researched for you, since I am not in that particular level to know that knowledge yet. I assure this is accurate info :)]

The answer is A, red.
"Remember, the color you see is light REFLECTING off the surface of that object. If all colors are absorbed in to the surface EXCEPT red, red must be reflected, and you'll see red." - Yahoo User @Chap
8 0
3 years ago
In an experiment refractive index of glass was observed to be 1.45,1.56,1.54,1.44,1.54and1.53. Calculate mean value of refractiv
Sever21 [200]
The mean may be calculated by summing the values of the refractive index and dividing the sum by the number of experiments. This is:
Mean = (1.45 + 1.56 + 1.54 + 1.44 + 1.54 + 1.53)/6
Mean = 1.51

The mean absolute error is the sum of the absolute values of errors divided by the number of trials:
MAE = (|1.45-1.51|+|1.56-1.51|+|1.54-1.51|+|1.44-1.51|+|1.54-1.51|+|1.53-1.51|)/6
MAE = 0.043

The fractional error is the MAE divided by the actual value:
Fractional error = 0.043 / 1.51
Fractional error = 43/1510

The percentage error is the fractional error multiplied by 100:
Percentage error = 2.85%
7 0
3 years ago
Define linear expansivity
lidiya [134]

Linear expansivity is a type of thermal expansion. It is described by a fraction that represents the fractional increase in length of a thin beam of a material exposed to a temperature increase of one degree Celsius. ... Linear expansivity is used in many real world applications.

8 0
3 years ago
Read 2 more answers
______ creates heat in earths interior when dense substance sink into earths core.
anastassius [24]

The answer is A. Friction

hope this helps :)

7 0
3 years ago
Estimate how long it took King Kong to fall straight down from the top of the Empire State Building (380 m high). Express your a
ankoles [38]

Answer:

It will take 8.80 sec to fall from the building

Explanation:

We have given height pf the state building h = 380 m

Initial velocity will be 0 m /sec

So u = 0 m/sec

Acceleration due to gravity g=9.8m/sec^2

We have to find the fall time

According to second equation of motion h=ut+\frac{1}{2}gt^2

So 380=0\times t+\frac{1}{2}\times 9.8\times t^2

t^2=77.55

t = 8.80 sec

3 0
3 years ago
Other questions:
  • 4) You have a spring-loaded air rifle. When it is loaded, the spring is
    7·1 answer
  • Light striking a mirror at a 50° angle will be reflected at an angle _____.
    5·2 answers
  • Why does an astronaut in a spacecraft orbiting Earthexperience<br> a feeling of weightlessness?
    5·1 answer
  • Which of the following temperatures is the coldest? A) 5 degrees B)0 degrees C) -15 degrees D) -7 degrees
    13·2 answers
  • When you throw a ball up in the air, it travels up and then stops instantaneously before falling back down. At the point where i
    9·1 answer
  • PLEASE HELP ASAP!!!!!!!!!!WILL GIVE BRAINLIEST...
    14·2 answers
  • Please help, last question i can ask, brainest if correct
    7·1 answer
  • A gauge is attached to a pressurized nitrogen tank reads a gauge pressure of 28 in of mercury. If atmospheric pressure is 14.4 p
    8·1 answer
  • Which of the following least represents an negative impact on Earth caused mostly by humans?
    14·2 answers
  • <img src="https://tex.z-dn.net/?f=%5Chuge%5Cmathfrak%7BQuestion%3A-%7D" id="TexFormula1" title="\huge\mathfrak{Question:-}" alt=
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!