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
vitfil [10]
2 years ago
10

An object is thrown vertically up and attains an upward velocity of 34 m/s when it reaches one fourth of its maximum height abov

e its launch point. What was the initial speed of the object?

Physics
1 answer:
lesantik [10]2 years ago
4 0

Answer:

39.26 m/s

Explanation:

Let the maximum height at which the object reaches is h.

Let the initial speed f the object is u.

velocity at height h/4 is 34 m/s

acceleration due to gravity = 9.8 m/s^2

For AB part

Use third equation of motion for AB part

here, initial velocity is v = 34 m/s

Final velocity at maximum height, v' = 0

Height = h - h/4 = 3h/4

v^{2}=u^{2}-2gh

0^{2}=34^{2}-2\times 9.8 \times \frac {3h}{4}

h = 78.64 m

For OA part

initial velocity = u

final velocity, v = 34 m/s

Height = h / 4 = 78.64 / 4 = 19.66 m

Use third equation of motion

v^{2}=u^{2}-2gh

34^{2}=u^{2}-2\times 9.8 \times 19.66

u^{2}=1541.336

u = 39.26 m/s

You might be interested in
The amount of energy the body uses when at rest is referred to as _____.
Nesterboy [21]

The answer is Basal Metabolic Rate. It is the total amount of energy expressed in calories that an individual needs to keep the body working at rest. Some of those progressions are blood circulation, breathing, cell growth, controlling body temperature, nerve and brain function, and tightening of muscles.

8 0
3 years ago
What is the mass of an object that is hanging 12.6 m above the surface of the earth and has a
satela [25.4K]

Answer:

22.05 Kg

Explanation:

Apply the formula:

GPE = Gravity . Mass . ΔHigh

2778.3 = 10 . Mass . 12.6

2778.3 = 126 . Mass

Mass = 2778.3/126

Mass = 22.05

7 0
3 years ago
A 60kg bicyclist (including the bicycle) is pedaling to the
Fittoniya [83]

a) 4 forces

b) 186 N

c) 246 N

Explanation:

a)

Let's count the forces acting on the bicylist:

1) Weight (W=mg): this is the gravitational force exerted on the bicyclist by the Earth, which pulls the bicyclist towards the Earth's centre; so, this force acts downward (m = mass of the bicyclist, g = acceleration due to gravity)

2) Normal reaction (N): this is the reaction force exerted by the road on the bicyclist. This force acts vertically upward, and it balances the weight, so its magnitude is equal to the weight of the bicyclist, and its direction is opposite

3) Applied force (F_A): this is the force exerted by the bicylicist to push the bike forward. Its direction is forward

4) Air drag (R): this is the force exerted by the air on the bicyclist and resisting the motion of the bike; its direction is opposite to the motion of the bike, so it is in the backward direction

So, we have 4 forces in total.

b)

Here we can find the net force on the bicyclist by using Newton's second law of motion, which states that the net force acting on a body is equal to the product between the mass of the body and its acceleration:

F_{net}=ma

where

F_{net} is the net force

m is the mass of the body

a is its acceleration

In this problem we have:

m = 60 kg is the mass of the bicyclist

a=3.1 m/s^2 is its acceleration

Substituting, we find the net force on the bicyclist:

F_{net}=(60)(3.1)=186 N

c)

We can write the net force acting on the bicyclist in the horizontal direction as the resultant of the two forces acting along this direction, so:

F_{net}=F_a-R

where:

F_{net} is the net force

F_a is the applied force (forward)

R is the air drag (backward)

In this problem we have:

F_{net}=186 N is the net force (found in part b)

R=60 N is the magnitude of the air drag

Solving for F_a, we find the force produced by the bicyclist while pedaling:

F_a=F_{net}+R=186+60=246 N

3 0
2 years ago
Is this right?? please help me. IT IS SOCIOLOGY!!
Westkost [7]

Answer:

Yes, it is correct : )

Explanation:

Hope this helps!

8 0
2 years ago
Read 2 more answers
I need the answer right now pls help me
yaroslaw [1]

The AREA of the shaded region is the moving object's displacement.

7 0
3 years ago
Other questions:
  • what branch of Science studies matter and energy and the way they work together with force to cause motion
    11·1 answer
  • It takes 300 newtons of force and a distance of 20 meters for a moving car to come to stop
    11·1 answer
  • After training for a marathon, you would like to complete your first attempt of the 26.22 mile race in under 4.800 hours. At wha
    10·1 answer
  • Which one of the following statements is not a characteristic of a plane mirror?
    6·1 answer
  • The motion sensor depends on which of the following for its operation? 1. the emission of a short burst of sound waves. 2. doppl
    14·1 answer
  • Kinetic and potential; what type of energy is each of the points
    7·1 answer
  • What influences the strength of an electric field?
    12·2 answers
  • A wire is carrying current vertically downward. What is the direction of the force due to Earth's magnetic field on the wire?
    10·1 answer
  • Which fact is true during a fission chain reaction?
    5·1 answer
  • What is the force of gravity between two 50.0kg masses that are separated by 0.300m?3.71x10-8N5.59x10-7N2.78x104N1.85x10-6N
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!