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musickatia [10]
3 years ago
5

Which of the following statements about convection is true? A Convection can only occur during the process of boiling B Convecti

on always involves the circulation of a liquid or gas C All types of currents are convection currents D Convection occurs between solids only at high temperatures
Physics
1 answer:
Ivan3 years ago
6 0
The answer to your question is OPTION D
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What change will always result in an increase in gravitational force between two objects
tekilochka [14]

The gravitational force between two object depends on their masses and on their distance.


Since the formula is


F = G\frac{m_1m_2}{d^2}


If the masses grow, the force also grows. But I'm assuming the two objects are fixed, so you can't enlarge their mass.


So, the only option remaining is to lower their distance: since it sits at the denominator, a smaller value of d results in a bigger value for F.


So, if you reduce the distance between two objects, the gravitational force between them will always result in an increase

6 0
3 years ago
A quantitative description of kinematics involves using ___ th describe the motion
Semmy [17]

Answer:

numbers

Explanation:

Virtually all unimaginable processes can be described as the movement of certain objects. To analyze and predict the nature of the movements that result from the different kinds of interactions, some important concepts such as momentum, force and energy have been invented. If momentum, force, and energy are known and expressed in a quantitative way (that is, by numbers) it is possible to establish rules by which the resulting movements can be predicted.

4 0
3 years ago
A flat, horizontal uniform plank is supported underneath by a triangular wedge which itself rests on flat, level ground. An obje
ser-zykov [4K]

Answer:C

Explanation:

Given

weight of object is equal to weight of object

Suppose weight of Planck is W

suppose weight is at distance of x cm from wedge

balancing Torque

w\times x-w(\frac{L}{2}-x)=0

2x=\frac{L}{2}

x=\frac{L}{4}

i.e. at a distance of 0.25L from the Left end  

7 0
3 years ago
Read 2 more answers
PLEASE HELP’!
salantis [7]

Answer:

 a= g sinθ

Explanation:

Given that

Angle ,θ = 15° (from the horizontal)

Lets take the mass of the block = m

The acceleration due to gravity = g

The acceleration of the block = a

When block slide down :

The gravitational force on the block =  m g sinθ

By using Newton's second law

F= m a

F=Net force ,a acceleration ,m=mass

m g sinθ =  ma

a= g sinθ

Therefore the acceleration of the block will be g sinθ.

3 0
3 years ago
Technician A says that an oxygen sensor can have​ one, two,​ three, four, or more​ wires, depending on the style and design. Tec
alisha [4.7K]

Answer:

Both technicians A and B are right.

Explanation:

-The most common application is to measure the exhaust-gas concentration of oxygen.The probe typically has four wires attached to it: two for the lambda output, and two. The number of wires depends on design and style.

-An oxygen sensor will typically generate up to about 0.9 volts(\approx 1.0V) when the fuel mixture is rich and there is little unburned oxygen in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1( \approx 0.0V)volts

7 0
3 years ago
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