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
Bezzdna [24]
3 years ago
15

A cannon fired horizontally at 20 m/s from the top of a cliff lands 80m away. how tall is the cliff

Physics
1 answer:
Scorpion4ik [409]3 years ago
8 0

Answer:

The height of the cliff is, h = 78.4 m

Explanation:

Given,

The horizontal velocity of the projectile, Vx = 20 m/s

The range of the projectile, s = 80 m

The projectile projected from a height is given by the formula

                            <em> S = Vx [Vy + √(Vy² + 2gh)] / g </em>

Therefore,  

                            h = S²g/2Vx²

Substituting the values

                             h = 80² x 9.8/ (2 x 20²)

                                = 78.4 m

Hence, the height of the cliff is, h = 78.4 m

You might be interested in
Ulesr...<br> 4.What makes the molecular shape of Co, and NH, different? (2 points)<br> luence.
hichkok12 [17]

The shape is square pyramidal based on an oc- tahedral arrangement of electrons about the Xe atom

hope this helped

7 0
3 years ago
When a 12 N horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of friction acting
Mrrafil [7]

Answer:

12N

Explanation:

when a force is applied to a body but still stays at rest or moves at a constant speed , the frictional force is equal to the force applied

3 0
3 years ago
Calculate the energy absorbed when 13 kg of liquid water raises from 18°C to 100°C and then boils at 100°C.
Cloud [144]

Answer:

the energy absorbed is 4.477 x 10⁶ J

Explanation:

mass of the liquid, m = 13 kg

initial temperature of the liquid, t₁ = 18 ⁰C

final temperature of the liquid, t₂ = 100 ⁰C

specific heat capacity of water, c = 4,200 J/kg⁰C

The energy absorbed is calculated as;

H = mcΔt

H = mc(t₂ - t₁)

H = 13 x 4,200(100 - 18)

H = 4.477 x 10⁶ J

Therefore, the energy absorbed is 4.477 x 10⁶ J

5 0
3 years ago
How does acceleration due to gravity changes wit depth?
ivann1987 [24]

Decreases

Explanation:

The acceleration due to gravity on a body decreases with depth.

Acceleration due to gravity is the change in velocity with time of a body as result of the pull of gravity or gravitational force.

  • The acceleration due to gravity tend to pull all bodies to the center of the earth.
  • As body moves away from the center of the earth, the pull becomes very more and acceleration increase.
  • But when a body approaches the center of the earth, the acceleration reduces.
  • At depth, the acceleration due to body of a body begins to decrease.

learn more:

Gravity brainly.com/question/10934170

#learn more brainly.com/question/10934170

#learnwithBrainly

7 0
3 years ago
A 62.5 kg carpenter at a construction site plans to swing in a circular arc from one roof top to an adjacent roof at the end of
denis23 [38]

Answer:

    v = 9.45 m/s

Explanation:

given,

mass of the carpenter = 62.5 Kg

length of rope = 13.4 m

Capable of exerting force = 1034 N

centripetal force acting on the body

                   F = \dfrac{mv^2}{r}

                   F = \dfrac{62.5\times v^2}{13.4}

                  F =4.664 v²  N

Gravitational force on her =

                  F = m g

                  F = 62.5 x 9.81

                  F = 613.125 N

now,

4.664 v² + 613.125 = 1034

4.664 v² = 420.875

   v²  = 90.24

    v = 9.45 m/s

Maximum speed which she can tolerate = v = 9.45 m/s

7 0
3 years ago
Other questions:
  • Shelly experiences a backward jolt when the driver starts the school bus. Which of the following explains this phenomenon? A. th
    11·2 answers
  • A ball is thrown upward at a 45° angle. Inthe absence of air resistance, the ballfollows aA. tangential curve.B. sine curve.C. p
    6·1 answer
  • If you complete a 10K marathon, how many miles have you traveled? Show all your math steps include units with your answer, and e
    13·1 answer
  • What element is named for the inventor of dynamite?
    14·1 answer
  • Stored energy due to the interactions between objects
    14·1 answer
  • Light____.
    15·2 answers
  • 1. How many seconds in 1 year?
    8·2 answers
  • A balance between gravity and bouyancy is called
    11·1 answer
  • A car drives around a curve with a radius of 42 m at a velocity of 24m/s. What is the centripical acceleration of the car?
    8·1 answer
  • Create a hypothesis for this testable question: How does price affect the amount of chocolate people buy?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!