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3 years ago

Can someone help me with these two? Pls

Physics

1 answer:

Gelneren [198K]3 years ago

8 0

For the first one: A falling object has higher gravitational potential energy and as it falls this decreases but kinetic energy increases. As the object hits the floor, energy is transferred to heat and sound.

42*9.8*12= 4939.2
Kinetic energy = 4939.2 OR 4939

To find the final speed use the kinetic energy formula;

Ek = 1/2 MV2

4939=1/2*42*v2
V2= 4939 divided by (1/2 * 42)
V2= 4939 / 21
V2= 235.1904761904762
Find square root
V= 15.3359211067
= 15.

Reach the ground at 15m s -¹

Note:
Formula To calculate kinetic energy:
Ek = 1/2 MV2
Ek= kinetic energy of an object
M= mass of object
V= velocity/speed of object

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Taking into account the definition of speed, the average speed of the car in the trip is 57.14 $\frac{miles}{hour}$ .

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Speed is a physical magnitude that relates the displacement of an object and the time it takes to make this change in position.

So, the speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:

$speed=\frac{displacement}{time}$

Speed has units of $\frac{distance}{time}$ , such as $\frac{meters}{second}$ or $\frac{miles}{hour}$ .

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In this case, you know that:

displacement= 200 miles
time= 3.5 hours

Replacing in the definition of speed:

$speed=\frac{200 miles}{3.5 hours}$

<u><em>speed= 57.14 </em></u> $\frac{miles}{hour}$

Finally, the average speed of the car in the trip is 57.14 $\frac{miles}{hour}$ .

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2 years ago

Jaipal measures a circuit at 1.2 A and 24 . Using Ohm’s law, what can he calculate for the circuit? current (C) current (I) volt

jenyasd209 [6]

Answer: voltage (V)

Explanation:

Hi, in the answer the letter A (1.2 A) stands for Ampere, and the symbol next to the number 24 must be Ω 8 (Ohms)

So, applying Ohm's law:

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V = I x R

Replacing with the values given;

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In conclusion, we can calculate the value of Voltage for the circuit.

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Explanation:

Relationships to remember:

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