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
GrogVix [38]
3 years ago
6

A cannonball is launched with initial velocity of magnitude v0 over a horizontal surface. At what minimum angle

Physics
1 answer:
melisa1 [442]3 years ago
4 0

Answer:

A)   θmin= 76°.

Explanation:

Given that

Speed of cannonball = Vo

Lets take θ is the angle measure from horizontal

We know that

Range R

R=\dfrac{V_o^2sin2\theta }{g}

Height h

h=\dfrac{V_o^2sin^2\theta }{2g}

Given that h should be larger than R

         h > R

\dfrac{V_o^2sin^2\theta }{2g}>\dfrac{V_o^2sin2\theta }{g}

{sin^2\theta }>2{sin2\theta }

{sin^2\theta }>4{sin\theta\ cos\theta  }

{tan\theta }>4

        θ  >75.96°

So minimum angle should be 75.96° or 76°.

You might be interested in
A key falls from a bridge that is 45 m above the water. the key falls straight down and lands in a model boat traveling at a con
erastova [34]

Let the key is free falling, therefore from equation of motion

h = ut +\frac{1}{2}gt^2..

Take initial velocity, u=0, so

h = 0\times t + \frac{1}{2}g t^2= \frac{1}{2}gt^2.

h = 0\times t + \frac{1}{2}g t^2= \frac{1}{2}gt^2 \\\ t =\sqrt{\frac{2h}{g} }

As velocity moves with constant velocity of 3.5 m/s, therefore we can use formula

d= v \times t

From above substituting t,

d = v \times \sqrt{\frac{2h}{g} }.

Now substituting all the given values and g = 9.8 m/s^2, we get

d = 3.5 \ m/s \times \sqrt{\frac{2 \times 45 m}{9.8 m/s^2} } = 10.60 m.

Thus, the distance the boat was from the point of impact when the key was released is 10.60 m.

7 0
3 years ago
What is a conservative force?
almond37 [142]

Answer:

A conservative force is a force with the property that the total work done in moving a particle between two points is independent of the path taken Equivalently if a particle travels in a closed loop the total work done by a conservative force is zero

Explanation:

8 0
3 years ago
About how many weeks does it take the Moon to go from a full Moon phase to a third quarter phase? A. 1 B. 2 C. 3 D. 4
Lostsunrise [7]
The answer is D) About 4.
~Deceptiøn
3 0
3 years ago
Use the five rules to determine the validity of this categorical syllogism:
Novay_Z [31]

Question:

The five rules are;

"The middle term must be distributed in at least one premise.

If a major or minor term is distributed in the conclusion, then it must be distributed in the premises.

No syllogism can have two negative premises.

If either premise is negative, the conclusion must be negative.

No syllogism with a particular conclusion can have two universal premises."

Answer:

The categorical syllogism is invalid as it does not meet thr requirements of rule 2

Invalid because it breaks rule #2.

Explanation:

An argument whose conclusion is  implied based on the logical stipulation of the premise is a deductive argument

A  syllogism is a deductive argument that makes use of deductive reasoning to come to  conclusion, considering a number of of two or more premises which are taken to be true.

For categorical syllogism, we have

If  A is in C, then B is in C

Based on the five rules, we have

1. The middle term must be distributed at least once

Here, the middle term is all neutron stars are extremely dense hence i says something about all items in a category, therefore it is distributed

2. If a term is distributed in the conclusion, then it must be distributed in the premise.

Here, the distributed term in the conclusion are "extremely dense objects" is not distributed in the premise, therefore the categorical syllogism is invalid.

4 0
3 years ago
The electric motor in the car is powered by a battery.
Vinil7 [7]

Answer:

I = 30 A.

Explanation:

Given that,

The voltage of the battery, V = 230 V

Power used to charge the battery, P = 6.9 kW

We need to find the current used to charge the battery. The formula for the power is given by :

P = VI

Where

I is current

So,

So, the required current is 30 A.

6 0
2 years ago
Other questions:
  • 2. A/An _______ is composed of two or more types of matter that can be present in varying amounts.
    12·2 answers
  • Which of the following best illustrates chemical potential energy a dog Plane, gasoline gasoline, water moving down hill, a skyd
    8·1 answer
  • The bent rod is supported by a smooth surface at b and by a collar at a, which is fixed to the rod and is free to slide over the
    13·1 answer
  • A man is walking while riding a train. He says he is moving at 2 mph. A woman standing on a platform at a train station says the
    7·1 answer
  • Matter is needed to transfer thermal energy by
    6·1 answer
  • Help. Science is getting on my nerves
    11·2 answers
  • 3) Скорость автомобиля увеличилась от 10 м/с до 20 м/с. Во сколько раз увеличилась его
    12·1 answer
  • Any four difference between velocity and acceleration​
    8·1 answer
  • What can you infer from the fact that metals are good conductors of electricity?
    12·2 answers
  • What is the speed of rocket that travels 9km in 10 seconds​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!