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3 years ago

Among the alkali earth metals, the tendency to react with other substances

Physics

2 answers:

kati45 [8]3 years ago

5 0

Answer is D hope this helps

padilas [110]3 years ago

4 0

Answer D
In alkali earth metals reacrivity increases from top to bottom (opposite of b)
This is because as you go down, the electron shells increase by 1 shell. The farther away a shell is from the nucleus, the higher its tendency to react.
D is true because the more reactive an alkali metal is, the more vigorous the reaction will be with water.

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natita [175]

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5 0

3 years ago

In the Olympic shotput event, an athlete throws the shot with an initial speed of 13.0 m/s at a 47.0° angle from the horizontal.

MariettaO [177]

Answer:

18.7 m

Explanation:

$v_{o}$ = initial speed of the shot = 13 m/s

θ = angle of launch from the horizontal = 47 deg

Consider the motion along the vertical direction

$v_{oy}$ = initial velocity along vertical direction = 13 Sin47 = 9.5 m/s

$a_{y}$ = acceleration along the vertical direction = - 9.8 m/s²

y = vertical displacement = - 1.80 m

t = time of travel

Using the kinematics equation

$y=v_{oy} t+(0.5)a_{y} t^{2}$

- 1.80 = (9.5) t + (0.5) (- 9.8) t²

t = 2.11 s

Consider the motion along the horizontal direction

x = horizontal displacement of the shot

$v_{ox}$ = initial velocity along horizontal direction = 13 Cos47 = 8.87 m/s

$a_{x}$ = acceleration along the horizontal direction = 0 m/s²

t = time of travel = 2.11 s

Using the kinematics equation

$x=v_{ox} t+(0.5)a_{x} t^{2}$

x = (8.87) (2.11) + (0.5) (0) (2.11)²

x = 18.7 m

8 0

3 years ago

A loop of wire is perpendicular to a magnetic field such that the field is coming straight at you through the loop. The field be

Umnica [9.8K]

Answer:

we will have induced magnetic field towards us

now in order to induce the magnetic field towards us we must have induced current in the loop and its direction is counterclockwise.

Explanation:

As per lenz law we know that the rate of change in magnetic flux linked with the closed loop will induced EMF in the loop and the direction of this induced current in the loop will always oppose the causes due to which it is induced

Here we know that magnetic field is straight towards us and it start decreasing with time

So we can say that flux linked with the coil will also decrease with time

Now as per lenz law the induced magnetic field of the loop is in such a direction that it will increase the magnetic flux in the coil.

So we will have induced magnetic field towards us

now in order to induce the magnetic field towards us we must have induced current in the loop and its direction is counterclockwise.

5 0

3 years ago

An elevator has a weight of 14,700 N and has an acceleration of –0.30 m/s2. The free-body diagram shows the forces acting on the

qwelly [4]

14250. I just took it

4 0

3 years ago

Read 2 more answers

Oxidation and reduction are processes which

Firlakuza [10]

Answer:

Oxidation is increase in oxidation number while reduction is decrease in oxidation number.Redox is change in oxidation number.

4 0

3 years ago