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3 years ago

Which determines the reactivity of an alkali metal?

Physics

1 answer:

shutvik [7]3 years ago

8 0

Answer:

Explanation:

I'm pretty sure it's A because when you look up the properties of alkali metal it states stuff about its melting points and what to expect. (correct me if I'm wrong but I had this same question on a test and I'm sure this is the answer lol)

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You venture out on a cold winter morning to warm up your vehicle. You have layers of cotton/polyester blend clothes on and from

maxonik [38]

Answer:

A. There is a localization of positive charge near the door handle.

Explanation:

When on a cold morning a person wearing cotton/ polyester cloth walking on the carpet moves toward his car then due to friction between the feet and the carpet there are transfer of electrons from the carpet to our feet, and since our body is a good conductor of electricity the charges spread throughout on the surface of or body.

When the person brings his hands close to the neutral conducting door of the car it gets induced with equal intensity of opposite charge to our hands thus having a concentration of positive charges near to the hand on the car's door is developed as a result of polarization within the conductor.

3 0

3 years ago

The force per meter between the two wires of a jumper cable being used to start a stalled car is 0.244 N/m. (a) What is the curr

MakcuM [25]

Answer: current I is 144amp(A)

Explanation: The force per lenght F/L, current l, and separation distance r are related by the formula

F/L = permeability of space* I²/2*pi*r

Permeability of free space is 1.257*EXP {-6} Henry/meter

F/L is 0.244 N/m, pi is 3.142,

r is 1.7cm which is equal to 0.017meter.

I is what we are looking for.

Now we have after substitution,

0.244

= 1.257*EXP {-6} * I²/(2*3.142*0.017)

After cross multiplying and making I² subject of formula we have,

0.0261/(1.257*EXP {-6}) = I²

I = √{20736.7} =144ampere(A)

That means in each of the jumper wire there is 144amp(A)

8 0

3 years ago

Which of these objects has the least amount of inertia? A a cricket B a bicycle C a baseball

LenaWriter [7]

The least amount of inertia would be the one with least mass.

Of all the options, the smallest mass is likely the insect the cricket.

A a cricket

5 0

4 years ago

What provides the centripetal force needed to keep Earth in orbit?

laiz [17]

option C ............

8 0

3 years ago

Read 2 more answers

Penguin #1 travels at speed v=0.9 c relative to penguin #2. At the instant that both are at the origin, they synchronize their c

Alekssandra [29.7K]

Answer:

L = 0.44 [m]

Explanation:

Here we can use the Lorentz transformation related to length to solve it:

$L=L_{0}\sqrt{1-\beta^{2}}$

Where:

L₀ is the length of the moving reference frame (penguin #1)

L is the length of the fixed reference frame (penguin #2)

β is the ratio between v and c

We know that v = 0.9c so we can find β.

$\beta = \frac{0.9c}{c}=0.9$

$L=1 [m]\sqrt {1-0.9^{2}} = 0.44 [m]$

Therefore, the length of the meter stick of #1 observed by #2 is 0.44 m.

I hope it helps you!

6 0

4 years ago