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egoroff_w [7]
3 years ago
9

When you throw a ball upward, its kinetic energy and its potential energy . When the ball reaches maximum height, its kinetic en

ergy is at a .
Physics
2 answers:
emmasim [6.3K]3 years ago
8 0
It has zero kinetic energy, more potential energy
kvasek [131]3 years ago
4 0

Answer:

When the ball reaches maximum height,its kinetic energy is zero and is converted to potential energy and the velocity of the ball is zero.

Explanation:

When the ball is falling to the ground,the potential energy is then converted to kinetic energy.

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Which of the following is true of alternating current? Select all that apply.
Nitella [24]

Answer:

The correct option is (C).

Explanation:

Electric current can be direct or alternating.

The direct current flows only in one direction. It is unidirectional.

The alternating current or an C current reverse its direction periodically.

So, the correct statement regarding the alternating current is (c) i.e. Electrons reverse direction periodically.

7 0
3 years ago
If a 2 kg ball is traveling at a speed of 4 m/s, what is its kinetic energy?
Kay [80]

Answer: 16J

Explanation:

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

K.E = \frac{1}{2} X 2 X 16

K.E = 16

8 0
3 years ago
Read 2 more answers
Two objects that are not initially in thermal equilibrium are placed in close contact. After a while, the temperature of the cod
Dima020 [189]

Answer:

If the temperature of  the colder object rises by the same amount as the temperature of the hotter object drops, then <u>the specific heats of both objects will be equal.</u>

Explanation:

If the temperature of  the colder object rises by the same amount as the temperature of the hotter object drops when the two<u> objects of same mass</u> are brought into contact, then their specific heat capacity is equal.

<u>We can prove this by the equation of heat for the two bodies:</u>

<em>According to given condition,</em>

\Delta T_1=\Delta T_2

\frac{Q_1}{m_1.c_1} = \frac{Q_2}{m_2.c_2}

<em>when there is no heat loss from the system of two bodies then </em>Q_1=Q_2

\frac{1}{m.c_1} =\frac{1}{m.c_2}

\Rightarrow c_1=c_2

  • Thermal conductivity is ultimately affects the rate of heat transfer, however the bodies will attain their final temperature based upon their mass and their specific heat capacities.

The temperature of the colder object will rise twice as much as the temperature of the hotter object only in two cases:

  • when the specific heat of the colder object is half the specific heat of the hotter object while mass is equal for both.

OR

  • the mass of colder object is half the mass of the hotter object while their specific heat is same.
3 0
3 years ago
A cell phone weighing 80 grams is flying through the air at 15 m/s. What is its kinetic energy
Contact [7]

Answer:

The kinetic energy of the cell phone is 9J

Explanation:

The kinetic energy is the energy possessed by a body by virtue of motion.

The kinetic energy is expressed as

KE= 1/2m(v)²

Given data

Mass of cell phone m= 80g--to kg=80/1000= 0.08kg

Velocity of cell phone v= 15m/s

Substituting our given data we have

KE= 1/2*0.08(15)²

KE= (0.08*225)/2

KE=18/2

KE= 9J

8 0
3 years ago
State the equation of momentum impulse theorem.
Paladinen [302]

Answer:

J = Δp

Explanation:

The impulse-momentum theorem says that the impulse J is equal to the change in momentum p.

J = Δp

3 0
3 years ago
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