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
ASHA 777 [7]
3 years ago
15

A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle abov

e the horizontal. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass just before it strikes the ground? Answer: 0.97 kJ.
Physics
1 answer:
Digiron [165]3 years ago
3 0

Ox:vₓ=v₀

x=v₀t

Oy:y=h-gt²/2

|vy|=gt

tgα=|vy|/vₓ=gt/v₀=>t=v₀tgα/g

y=0=>h=gt²/2=v₀²tg²α/2g=>tgα=√(2gh/v₀²)=√(2*10*20/24²)=√(400/576)=0.83=>α=tg⁻¹0.83=39°

cosα=vₓ/v=v₀/v=>v=v₀/cosα=24/cos39°=24/0,77=31.16 m/s

Ec=mv²/2=2*31.16²/2=971.47 J=>Ec≈0.97 kJ

You might be interested in
What is a discussion?
kap26 [50]

Answer:

um, when you talk with other people about stuff. (I'm not trying to sound like a smarta s s I'm just giving a definition...)

Explanation:

7 0
3 years ago
Read 2 more answers
A point charge of 5.7 µc moves at 4.5 × 105 m/s in a magnetic field that has a field strength of 3.2 mt, as shown in the diagram
Sauron [17]

The magnitude of the force on the charge by the influence of the magnetic field will be 6.6*10^-3 N

<h3>What is magnetic force?</h3>

Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion.The magnitude of the magnetic force acting on the charge is given by:

\rm F=qvBsin\theta

where

The magnitude of the charge   q=5.7\ \mu C =5.7\times 10^{-6} \ C

The velocity of the charge        v=4.5\times 10^5\ \frac{m}{s}

The magnitude of the magnetic field   3.2\ mT=0.0032\ T

The angle between the directions of v and B  \theta =90^o-37^o=53^o

By substituting the values we will get:

F=(5.7\times 10^}-6})(4.5\times 10^5)(0.0032)(Sin53^o)

F=6.6\times 10^{-3}\ N

Hence the magnitude of the force on the charge by the influence of the magnetic field will be 6.6*10^-3 N

To know more about Magnetic force follow

brainly.com/question/14411049

3 0
2 years ago
Which of the following is an example of kinetic energy?
tresset_1 [31]
B. Sound, because everything else sits still and sound waves move
5 0
3 years ago
A 23.5 kg object travels a distance of 85 m in 30 s. Find the momentum. (Hint: you must find speed first)
VLD [36.1K]
Yup, I think you add all of them
7 0
3 years ago
If a cart of 10 kg mass has a force of 5 newtons exerted on it, what is its acceleration? m/s2
Elza [17]

Answer:

= 0.5 m/s²

Explanation:

  • According to Newton's second law of motion, the resultant force is directly proportion to the rate of change of linear momentum.

Therefore;<em> F = ma , where F is the Force, m is the mass and a is the acceleration.</em>

<em>Thus; a = F/m</em>

<em>but; F = 5 N, and m = 10 kg</em>

<em>  a = 5 /10</em>

    <u>= 0.5 m/s²</u>

4 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone help me with this please
    10·1 answer
  • Question 1
    10·2 answers
  • An iron cannon ball and a bowling ball are dropped at the same time from the top of a building. At the instant before the balls
    6·1 answer
  • (ANSWER FAST) Three resistors of 1 Ω, 2 Ω and 3 Ω are connected in parallel. what should be The combined resistance of the three
    7·2 answers
  • A chemical reaction occurs. Which of the following would indicate that energy is transformed during the reaction?
    14·2 answers
  • Suppose the electric company charges 10 fils per kW h. How much does it cost to use a 125 watt lamp 4 hours a day for 30 days? A
    11·1 answer
  • When an electromagnetic wave falls on a white, perfectly reflectingsurface, it exerts a force F on that surface. If the surfacei
    9·1 answer
  • What do all the items that light up a bulb have in common? (help)
    6·1 answer
  • Using science terms like force, mass, energy, and inertia, describe how you could get an object to fly a further distance in a c
    7·1 answer
  • Assume that the ammeter in the figure below is removed and the current that flows through the 4.0Ω path, I3, is unknown. Determi
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!