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3 years ago

Look at the photo and answer the question

Physics

2 answers:

Naddik [55]3 years ago

5 0

Answer:

I think D. maybe C

Explanation:

newtons is force of gravity and grams can be weight or mass in the metric system

rjkz [21]3 years ago

4 0

Yeah my best guess would be C but like the answer before it is grams for weight but I could be confusing it with mass but C would be my safe and best guess

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Based on the data given, in what direction will the car accelerate?

skad [1K]

Vertical forces:
There is a force of 579N acting upward, and a force of 579N
acting downward.
The vertical forces are balanced ... they add up to zero ...
so there's no vertical acceleration.
Not up, not down.

Horizontal forces:
There is a force of 487N acting to the left, and a force of 632N
acting to the right.
The net horizontal force is

(487-left + 632-right) - (632-right - 487-right) = 145N to the right.

The net force on the car is all to the right.
The car accelerates to the right.

7 0

3 years ago

If light energy to electric energy conversion using solar cells is 12 % efficient, how many square miles of land must be covered

umka2103 [35]

Complete Question

The light energy that falls on a square meter of ground over the course of a typical sunny day is about 20 MJ . The average rate of electric energy consumption in one house is 1.0 kW .

If light energy to electric energy conversion using solar cells is 12 % efficient, how many square miles of land must be covered with solar cells to supply the electrical energy for 350000 houses? Assume there is no cloud cover.

Answer:

The area is $A = 1.26 *10^{7} m^2$

Explanation:

From the question we are told that

The efficiency is $\eta =$ 12%

The number of houses is $N = 350000$

The light energy per day is $E = 20 \ MJ$

The average rating of electric energy for a house is $E_h = 1.0 \ k W = 1000W$

Generally the electric energy which the solar cells covering $1 \ m^2$ produces in a day is

$E_s = \eta * E$

$E_s = 0.12 * 20*10^{6}$

$E_s = 2.4 MJ m^{-2}$

Energy for required by one house for one day is

$E_H = E_h * 1 \ day$

$E_H = 1000 * 24 * 3600$

$E_H = 86.4 MJ$

Energy needed for 350000 house is

$E_z = 86.4 *10^{6} * 350000$

$E_z = 3.02 *10^{7} MJ$

The area covered is mathematically represented as

$A = \frac{3.02*10^{7} \ MJ}{2.4 \ MJ m^{-2}}$

$A = 1.26 *10^{7} m^2$

5 0

3 years ago

How many turns should a coil wrapped around the outside of the solenoid have so that the emf induced in the coil is 15 V

Temka [501]

The number of turns a coil wrapped around the outside of the solenoid should have is : 127 turns

Given data :

Diameter of solenoid = 25-cm

Rate of increase of magnetic field = 2.4 T/s

Induced emf = 15 v

<h3>Determine the number of turns of the coil</h3>

Induced emf = N ( dФ / dt ) ---- ( 1 )

where : ( dФ / dt ) = ( A (db/dt) )

Equation ( 1 ) becomes

Induced emf = N A ( db/dt ) ------ (2)

From equation ( 2 )

N = Induced emf / A ( db/dt ) ------ ( 3 )

where : Induced emf = 15 v . db/dt = 2.4 T/s , A = area of solenoid

Area of solenoid = πr² = π * ( 0.125 )²

Insert values into equation ( 3 )

N = 15 / ( π * ( 0.125 )² ) * 2.4

= 127.32 ≈ 127 turns

Hence we can conclude that The number of turns a coil wrapped around the outside of the solenoid should have is : 127 turns.

Learn more about solenoid : brainly.com/question/25562052

Below is the missing part of the question

The magnetic field inside a 25-cm-diameter solenoid is increasing at 2.4 T/s

6 0

2 years ago

HURRY The compressed spring of a dart gun has potential energy of 50 J. If the spring constant is 200 N/m, what is the displacem

Crank

Spring potential energy:
E = 0.5 * k * x²

k spring constant
x spring compression

x = √(2 * E / k) = 0.7

7 0

3 years ago

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4 years ago