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
DedPeter [7]
3 years ago
9

A 0.57 kg rubber ball has a speed of 1.2 m/s at point A and kinetic energy 7.5 J at point B. Find a) the ball’s kinetic energy a

t A.(b) What is its speed at point B?(c) What is the total work done on the particle as it moves fromA to B?
Physics
1 answer:
worty [1.4K]3 years ago
6 0

Answer:

Explanation:

mass m = .57 kg

speed at A ( v₁ ) = 1.2 m /s

a )

kinetic energy at A

= 1/2 x mass x velocity

= 1/2 x .57 x (1.2)²

= .41 J

b ) Let speed at B be v₂

given that

1/2 m x v₂² = 7.5

.5 x .57 v₂² = 7.5

v₂ = 5.13 m/s

c ) Work done on the particle  as it moves from A to B

= increase in kinetic energy

= 7.5 - .41

= 7.09 J

You might be interested in
A uniform disk has a moment of inertia that is (1/2)MR2. A uniform disk of mass 13 kg, thickness 0.3 m, and radius 0.2 m is loca
kicyunya [14]
The angular momentum of an object is equal to the product of its moment of inertia and angular velocity.
L = Iω
I = 1/2 MR²
I = 1/2 x 13 x (0.2)
I = 1.3

ω = 2π/t
ω = 2π/0.3
ω = 20.9

L = 1.3 x 20.9
= 27.2 kgm²/s
6 0
3 years ago
Read 2 more answers
A solid conducting sphere of radius 2 cm has a charge of 8microCoulomb. A conducting spherical shell of inner radius 4 cm andout
nika2105 [10]

Answer:

C) 7.35*10⁶ N/C radially outward

Explanation:

  • If we apply the Gauss'law, to a spherical gaussian surface with radius r=7 cm, due to the symmetry, the electric field must be normal to the surface, and equal at all points along it.
  • So, we can write the following equation:

       E*A = \frac{Q_{enc} }{\epsilon_{0}} (1)

  • As the electric field must be zero inside the conducting spherical shell, this means that the charge enclosed by a spherical gaussian surface of a radius between 4 and 5 cm, must be zero too.
  • So, the +8 μC charge of  the solid conducting sphere of radius 2cm, must be compensated by an equal and opposite charge on the inner surface of the conducting shell of total charge -4 μC.
  • So, on the outer surface of the shell there must be a charge that be the difference between them:

        Q_{enc} = - 4e-6 C - (-8e-6 C) = + 4 e-6 C

  • Replacing in (1) A = 4*π*ε₀, and Qenc = +4 μC, we can find the value of E, as follows:

      E = \frac{1}{4*\pi*\epsilon_{0} } *\frac{Q_{enc} }{r^{2} } = \frac{9e9 N*m2/C2*4e-6C}{(0.07m)^{2} } = 7.35e6 N/C

  • As the charge that produces this electric field is positive, and the electric field has the same direction as the one taken by a positive test charge under the influence of this field, the direction of the field is radially outward, away from the positive charge.
6 0
3 years ago
What is the primary source of energy for earths weather systems
PIT_PIT [208]
I believe the sun is the primary source of energy for Earth's weather system. The sun is the primary energy source for Earth's climate system which is the first set of essential principles of climate sciences. Additionally, it is the primary source that drives all weather events, including precipitation, hurricane and tornadoes. The sun drives the hydrologic cycle, and makes life on Earth possible. 
3 0
3 years ago
Which of the following is a physical property of wood
Black_prince [1.1K]
The density, hard, strong, and rough.
3 0
3 years ago
Read 2 more answers
The periodic wave in the diagram below has a frequency of 80. hertz.
ASHA 777 [7]

Answer:

hi how are you

2) 5/8

4) 5/8

6 0
2 years ago
Other questions:
  • you paddle a canoe with the force of 200N. you and the canoe have a combined mass of 97KG . what is the acceleration of the cano
    7·1 answer
  • A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm3. what is the volume of the ball?
    15·2 answers
  • Julie is making a capacitor with an area of 2.5 × 10–5 m2. The capacitance is 5.5 pF. What is the distance between the plates?
    11·1 answer
  • A cable that weighs 8 lb/ft is used to lift 900 lb of coal up a mine shaft 650 ft deep. Find the work done. Show how to approxim
    9·1 answer
  • Which type of energy warms the eartha surface
    15·2 answers
  • the diagram deliver of uniform mass supported at the middle point six Queens of equal mass are placed at mark 4 on on the lift h
    14·1 answer
  • Which of the following illustrates two resistors in a parallel circuit
    13·2 answers
  • Are these two correct ?
    13·1 answer
  • An object has an acceleration of 12.0 m/s/s. If the net force
    10·1 answer
  • describe the journey that light takes from the sun to your eye when you are looking at fish in a pond
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!