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
Mazyrski [523]
3 years ago
11

An object thrown in the air has a velocity after t seconds that can be described by v(t) = -9.8t + 24 (in meters/second) and a h

eight h(t) = -4.9t 2 + 24t + 60 (in meters). The object has mass m = 2 kilograms. The kinetic energy of the object is given by K = __1 2mv2 , and the potential energy is given by U = 9.8mh. Find an expression for the total kinetic and potential energy K + U as a function of time. What does this expression tell you about the energy of the falling object?
Physics
1 answer:
marin [14]3 years ago
6 0

Answer and Explanation: Kinetic energy is related to movement: it is the energy an object possesses during the movement. it is calculated as:

K=\frac{1}{2}mv^{2}

For the object thrown in the air:

K=\frac{1}{2}.2.[v(t)]^{2}

K=(-9.8t+24)^{2}

K=96.04t^{2}-470.4t+576

Kinetic energy of the object as a function of time: K=96.04t^{2}-470.4t+576

Potential energy is the energy an object possesses due to its position in relation to other objects. It is calculated as:

U=mgh

For the object thrown in the air:

U=9.8.2.h(t)

U=9.8.2.(-4.9t^{2}+24t+60)

U=-96.04t^{2}+470.4t+1176

Potential energy as function of time: U=-96.04t^{2}+470.4t+1176

Total kinetic and potential energy, also known as mechanical energy is

TME = 96.04t^{2}-470.4t+576 + (-96.04t^{2}+470.4t+1176)

TME = 1752

The expression shows that total energy of an object thrown in the air is constant and independent of time.

You might be interested in
A wave with a short wavelength will also have a (2 points)
Nana76 [90]
<span>c. low frequency and low energy</span>
6 0
3 years ago
Read 2 more answers
Two beams of coherent light travel different paths, arriving at point P. If the maximum destructive interference is to occur at
amid [387]
"The path difference between the two waves should be one-quarter of a wavelength" is the statement among the choices given in the question that describes the <span>path difference between the two waves. The correct option among all the options that are given in the question is the fifth statement or the penultimate statement.</span>
3 0
3 years ago
Hello please help i’ll give brainliest
Zarrin [17]

Answer:

C because it is in earth's mantle

3 0
3 years ago
1. Name two ways of applying forces ?​
Anna007 [38]

Answer: A force can be applied to another object by a direct push, pull, or drag.

Explanation:

4 0
2 years ago
Read 2 more answers
A train slows from 44 m/s to 19 m/s in 9 seconds. What is the train's acceleration? Show your work.
Korvikt [17]

Answer:

a = 2.77 [m/s²]

Explanation:

To solve this problem we must use the following equation of kinematics.

v_{f} =v_{o} -a*t

where:

Vf = final velocity = 19 [m/s]

Vo = initial velocity = 44 [m/s]

a = acceleration [m/s²]

t = time = 9 [s]

Note: The negative sign in the above equation means that the train is decreasing its velocity.

19 = 44 - a*9

9*a = 44 -19

a = 2.77 [m/s²]

3 0
3 years ago
Other questions:
  • Why is a suction effect experienced by a person standing close to the platform at a station when a fast train passes?
    12·1 answer
  • A child jumps on a trampoline. What causes the child to rise in the air?
    5·2 answers
  • Why can gases and liquids both transmit heat by convection?
    13·2 answers
  • A 5000 kg African elephant has a resting metabolic rate of 2500 W. On a hot day, the elephant's environment is likely to be near
    15·1 answer
  • How many photons are emitted per second by a He−Ne laser that emits 1.5 mW of power at a wavelength λ=632.8nm. What is the frequ
    14·1 answer
  • True or false describing a metal as malleable means that it can be pounded into a new shape
    12·1 answer
  • Black holes have three major parts that include:
    6·2 answers
  • Two positive charges of same magnitude are separated by some distance if we bring a unit positive charge from one charge to anot
    13·1 answer
  • A beam of light, initially travelling in the air, strikes water surface at an angle of 24.5° with the normal. If the speed of li
    6·1 answer
  • 1
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!