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
Eva8 [605]
3 years ago
14

A basketball referee tosses the ball straight up for the starting tipoff. at what velocity must a basketball player leave the gr

ound to rise 1.25 m above the floor in an attempt to get the ball?
Physics
1 answer:
sladkih [1.3K]3 years ago
5 0
Mgh=mv²/2

v=√2gh=√2·9.8·1.25=4.95m/s
You might be interested in
E) Thermal energy is released during
vichka [17]

Answer:

e) True, f) False

Explanation:

e) Let consider a close system, that is, a system with no mass interactions with surroundings. Then, we get the following expression by the First Law of Thermodynamics:

Q_{net,in} - W_{net, out} = \Delta U (1)

Where:

Q_{net, in} - Net input heat, measured in joules.

W_{net, out} - Net output work, measured in joules.

\Delta U - Change in thermal energy, measured in joules.

Please notice that work comprises all kind of work (i.e. mechanical, electric, magnetic), whereas heat comprises all heat interactions including chemical and radioactive phenomena.

If thermal energy is released, then \Delta U < 0, which is caused by three scenarios:

(i) Q_{net,in} < 0, W_{net, out} < 0, |Q_{net,in}|>|W_{net,out}|

(ii) Q_{net, in} > 0, W_{net,out} > 0, |Q_{net,in}|

(iii) Q_{net,in}< 0, W_{net, out}>0

In the case Q_{net,in} > 0, W_{net, out}, the thermal energy of the system is increased. Therefore, thermal energy is released during some energy conversions. Answer: True

f) A liquid solidifies when temperature goes below point of fusion, meaning a realease of heat with no work interactions. That is:

Q_{net, in} = \Delta U, Q_{net, in} < 0 (2)

If Q_{net, in} < 0, then  \Delta U < 0. Then, if a liquid absorbs heat energy, then thermal energy is increase and the liquid does not solidifies. Answer: False.

7 0
2 years ago
This glass of lemonade is sitting in the hot summer sun. As time passes, in which direction will heat transfer take place?
KiRa [710]

Answer:

c

Explanation:

8 0
2 years ago
Read 2 more answers
Define second class lever​
Aleks04 [339]

Answer:

Please find detailed explanation of second class levers below

Explanation:

Levers are one of the classes of machine that possesses three levels namely: first class, second class and third claas. A second class lever is the level of levers in which the load (L) is in between the pivot (F) and the effort (E).

Examples of second class levers include; wheelbarrow, a bottle opener etc. In the bottle opener for example, the bottle lid (load) is in between the pivot of the opener and the hand opening it (effort).

6 0
2 years ago
Why do people cover their flowers on a cool night. Think about radiation absorption conduction and temperature
Blababa [14]
When the temperature lowers the plants can freeze and die. One way to prevent that is to cover the plants so they dont freeze 

3 0
3 years ago
When gasoline is burned in a car engine,_____ energy is converted into _____ energy.
Kisachek [45]
<span>Chemical Energy is converted into Mechanical Energy.

</span>When gasoline is burned in a car engine, chemical energy is converted into mechanical energy.
8 0
3 years ago
Read 2 more answers
Other questions:
  • What is gene-environment interactions?
    10·1 answer
  • How does the electrostatic force compare with the strong nuclear force in the nucleus of an atom?
    5·2 answers
  • The number of electrons with the number of protons in a charged object
    8·1 answer
  • An electron is moving directly toward you in a horizontal path when it suddenly enters a uniform magnetic field that is either v
    15·1 answer
  • If a behavior tends to increase after a consequence occurs, that consequence is most likely used as.
    15·1 answer
  • Which of these components is not necessary for current to flow in a series or parallel circuit?
    11·1 answer
  • Sorry that i ask for too much but I'm horrible at this ⭐-_-
    6·2 answers
  • UV light has ______ wavelengths than visible light waves, and its peak energy is at a wavelength of ______.
    8·1 answer
  • A car accelerates at a constant rate of 3 m/s2 for 5 seconds. If it reaches a velocity of 27 m/s, what was its initial velocity?
    8·1 answer
  • a piston-cylinder apparatus has a 4 kg piston with a diameter of 5 cm resting on a body of water 60 cm high. atmospheric pressur
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!