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4 years ago

Please help!!

Physics

1 answer:

xz_007 [3.2K]4 years ago

3 0

Displacement is the area under the velocity/time graph. So for example this object's displacement in the first 3 seconds is (1/2)(3sec)(12.5 m/s)= 18.75m. (and then it starts backing up, displacement decreasing, after 3sec when velocity is negative).

But This object is never speeding up. Its velocity is smoothly decreasing at (25/6) m/s^2 (the slope of the graph). So the answer to the question is actually zero.

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A physicist performing a sensitive measurement wants to limit the magnetic force on a moving charge in her equipment to less tha

lawyer [7]

Answer:

Maximum charge will be $6.66\times 10^{-9}C$

Explanation:

We have given force ion the moving charge $F=10^{-12}N$

Maximum speed of the moving charge v = 30 m /sec

Magnetic field $B=5\times 10^{-5}T$

We have to fond the charge

Force on moving charge is given by

$F=qvB$

So $10^{-12}=q\times 30\times 5\times 10^{-5}$

$q=6.66\times 10^{-9}C$

Maximum charge will be $6.66\times 10^{-9}C$

5 0

3 years ago

Effects of heat on matter

kumpel [21]

Answer:

it can melt orcan put them past their boiling point

Explanation:

3 0

3 years ago

HELPPPP PLEASEEE , anyoneeee ?

pshichka [43]

Answer:

1.....

2.....

Explanation:

1. For the elements in column 1,2 and 13-18 the atoms in the same column have the same amount of outermost electrons, called valence electrons. Atoms in column 1 (H, Li and Na for example) have 1 valence electron.

2. Electron affinity increases from left to right across the periodic table. This is caused by the decrease in atomic radius. As we already explained, moving from left to right across a period, atoms become smaller and smaller as the atomic number increases.

6 0

3 years ago

Speedy Sue, driving at 34.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 160 m ahead traveling at 5.20 m/s

Zielflug [23.3K]

Answer:

there will be collision

Explanation:

$v_{s}$ = speed of sue = 34 m/s

$v_{v}$ = speed of van = 5.20 m/s

$v_{sv}$ = speed of sue relative to van = $v_{s} - v_{v}$ = 34 - 5.20 = 28.8 m/s

$d_{s}$ = stopping distance after brakes are applied

$D$ = distance between sue and van = 160 m

$v_{f}$ = final speed of sue = 0 m/s

$a$ = acceleration = - 1.80 m/s²

Using the kinematics equation

$v_{f}^{2} = v_{o}^{2} + 2 a d_{s}$

$0^{2} = 28.8^{2} + 2 (1.80) d_{s}$

$d_{s} = 230.4$ m

Since $d_{s} < D$

hence there will be collision

7 0

3 years ago

In general, a (an)<br> metal will be more reactive than an alkaline earth metal in the same period.

Dmitriy789 [7]

Alkali metal

Explanation:

In general, an alkali metal will be more reactive than an alkaline earth metal in the same period.

What determines reactivity of metals?

The electropositivity of metals determines how reactive they are.

Electropositivity or metallicity is a measure of the tendency of atoms of an element to lose electrons.
It is closely related to ionization energy and the electronegativity of an element.
The lower the ionization energy of an element, the more electropositive or metallic it is
Also, the more reactive it will be because, it can lose electrons more readily.
Across a period from left to right, electropositivity decreases and from top to down a group, it increases.
Since alkali metals are more electropositive than alkali earth metals, they are more reactive and readily lose their only electron.
This is why the most reactive metal is francium found in the lower left corner on the periodic table.
For non-metals, electronegativity is the most important factor.

Learn more:

Alkali metals brainly.com/question/6324347

Electronegativity brainly.com/question/11932624

#learnwithBrainly

5 0

3 years ago