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neonofarm [45]
3 years ago
14

A projectile is launched at an angle of 30° from the horizontal and lands 69 s later at the same height from which it was launch

ed. (a) What is the initial speed of the projectile (in m/s)?
Physics
1 answer:
RideAnS [48]3 years ago
5 0

Answer:

679.2 m/s

Explanation:

The formula for the time of flight of a projectile is given as,

T = 2usinФ/g ......................... Equation 1

Where T = Time of flight, u = initial velocity, Ф = angle of projectile to the horizontal, g = acceleration due to gravity.

make u the subject of the equation

u = Tg/2sinФ....................... Equation 2

Given: T = 69 s, Ф = 30°

Constant: g = 9.8 m/s²

Substitute into equation 2

u = (69×9.8)/(2×sin30)

u = 679.2 m/s.

Hence the initial speed of the projectile is 679.2 m/s

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Two particles are separated by a certain distance. The force of gravitational interaction between them is F0. Now the separation
inysia [295]

Answer:

F'=1/9*F0

Explanation:

F0 is the gravitational force between the particles. When the distance is triplicated we have that

F'=G\frac{m_1m_2}{(3r)^{2}}

where r is the distance before the particles are separated, m1 and m2 are the masses their masses and G is the Canvendish's constant.

By some algebra we have

F'=\frac{1}{9}G\frac{m_1m_2}{r^2}=\frac{1}{9}F_0

hope this helps!!

4 0
4 years ago
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Describe some of the hazards produced by volcanoes
Scrat [10]
The lava can even melt metal so after touching that you'll probably have to lose a limb the smoke can cause you to suffocate and when volcanoes erupt all those flying rocks can come down and destroy houses and kill people close by. 
3 0
4 years ago
a shopping bag can provide an upward force of 65N before breaking. A shopper puts 5 kg of groceries in the bag. If the shopper t
kipiarov [429]

Answer:

Since Force is Mass * Acceleration, the equation would be:

5kg * 2m^2 = 10N

<em>(10N is less than 65N)</em>

Therefore, it would not be enough force for the bag to break.

6 0
3 years ago
Two large parallel metal plates are 1.2 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces
zheka24 [161]

Answer:

E=1100V/m

                                                                     

Explanation:

Given           required           <u>solution</u>

V=6.6v         E=?                   V=Ed ;    V is the potential difference between                                                              

d=D/2=1.2cm/2=0.6cm=0.006m             the   halfway                  

                                                               E is the electric field between the two                                                                              

                                                                       plates.

                                                              d is the distance between the halfway.

So we can use the above formula to calculate the electric field.

    V=Ed   from this E=V/d  substitute the values from the given equation.

E=6.6v/0.006m

E= 1100 v/m

                                                                     

3 0
4 years ago
In the paralleling technique, the central ray of the x-ray beam must be _____ to the film sensor and the long axis of the tooth.
Wittaler [7]

The film sensor and the long axis of the tooth must be aligned perpendicular to the central ray of the x-ray beam when using the paralleling approach.

To find the answer, we need to know above the paralleling technique in the dental x-ray.

<h3>What is paralleling technique?</h3>
  • The paralleling technique is the most dependable method for capturing periapical x-rays because it produces high-quality images with little distortion.
  • The central x-ray beam should be pointed perpendicular to the long axis of the tooth in issue, and the film should be positioned parallel to it.
  • The paralleling technique is the most dependable method for capturing periapical x-rays because it produces high-quality images with little distortion.
  • The central x-ray beam should be pointed perpendicular to the long axis of the tooth in issue, and the film should be positioned parallel to it.
  • When preparing for an x-ray, it is imperative to keep in mind the root anatomy.
  • The maxillary occlusal plane of the patient should also be parallel to the ground.

Thus, we can conclude that, the film sensor and the long axis of the tooth must be aligned perpendicular to the central ray of the x-ray beam when using the paralleling approach.

Learn more about paralleling technique here:

brainly.com/question/28120540

#SPJ1

7 0
2 years ago
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