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3 years ago

Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?

Physics

2 answers:

QveST [7]3 years ago

6 0

Answer:

Magnesium is the correct answer

Explanation:

It is magnesium because as we move down the periodic table group, atomic sizes increase which is as a result of lesser forces of attraction between nucleus and valence of an atom which makes the atom to be prone to leave as electrons so easily, elements become more reactive.

But as we move along the period , atomic sizes decrease because there is a more force of attraction between nucleus of an atom and it valence electrons making it less reactive just as the case in magnesium. Other elements are more reactive than it across the group.

zlopas [31]3 years ago

6 0

Answer:

Magnesium

Explanation: Correct on edge!

Hope this Helps! :)

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A sports car engine delivers 150 kW to the driveshaft with a thermal efficiency of 20%. The fuel has a heating value of 35 000 k

Andreyy89

Answer:600 kW

Explanation:

Given

Power delivered $P=150 kW$

Fuel heating value $q=35,000 kJ/kg$

thermal Efficiency $\eta =\frac{Power}{Heat}$

$0.2=\frac{150}{35,000\times \dot{m}}$

where, $\dot{m} =mass\ flow\ rate\ of\ fuel$

$\dot{m}=\frac{150}{35,000\times 0.2}$

$\dot{m}=0.0214 kg/s$

For an Engine

$q\dot{m}=P+Q_r , where Q_r=heat\ rejected$

$Q_r=q\dot{m}-P$

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3 years ago

If there is an object in top of another object, why does the upper object exert a downward normal force?

rusak2 [61]

Answer:

This is because normal force is exerted perpendicularly to the point of contact between the upper and lower objects.

Explanation:

This is because the upper object is still subject to gravitational pull. Therefore, the amount of force it exerts on the lower object due to gravity will be equal to the normal force that acts in the negative direction of gravitational force. Additionally, normal force is evident because the upper object will not go into the lower object.

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3 years ago

a car accelerates uniformly at from rest at a speed of 23.7 km/h in 6.5s. find the distance the car travels during this time

hodyreva [135]

speed = distance / time

distance =speed × time

d = v × t

d= 23.7 kmh⁻¹ ˣ 6.5 s

d = 154.05 kmh⁻¹s.

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3 years ago

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