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3 years ago

What energy does a galloping horse and a speeding bullet represent

Physics

2 answers:

Alex73 [517]3 years ago

8 0

Since both of those things are <u>moving</u>,
they both have <em>Kinetic Energy</em>.

Darya [45]3 years ago

6 0

These are both forms of kinetic energy.

(: I hope this helps! :)

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When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less dam

Lesechka [4]

Answer:

0.55 m/s

Explanation:

Parameters given:

Mass of lighter car, m = 1400 kg

Mass of heavier car, M = 1850 kg

Initial speed of lighter car, u = -1.10 m/s (since it's moving to the left)

Initial speed of heavier car, U = 1.5 m/s

Final sped of heavier car, V = 0.25 m/s

Using the principle of conservation of momentum, total initial momentum is equal to total final momentum:

m*u + M*U = m*v + M*V

Inputting the values:

(1400 * -1.1) + (1850 * 1.5) = (1400 * v) + (1850 * 0.25)

-1540 + 2775 = 1400v + 462.5

1235 = 1400v + 462.5

1400v = 772.5

v = 772.5/1400

v = 0.55 m/s

4 0

4 years ago

Calculate the equivalent resistance of the circuit below.

expeople1 [14]

Answer:

30Ω

Explanation:

To calculate the equivalent resistance in the circuit, do the following:

Step 1:

10Ω and 20Ω are in series connection. Therefore their equivalent is: 10 + 20 = 30Ω

Step 2:

The equivalent resistance (30Ω) obtained from the above is in parallel connection with 30Ω resistance shown in the diagram above.

Therefore their equivalent is given by:

1/30 + 1/30 = 2/30 = 1/15.

Now invert to obtain the equivalent

Therefore, the equivalent is 15Ω

Step 3:

Determination of the overall equivalent of the resistance of the circuit.

The new equivalent resistance 15Ω obtained above is in series connection with 15Ω resistance in the diagram above.

Therefore their equivalent is given by:

15Ω + 15Ω = 30Ω

Therefore, the equivalent resistance in the circuit is 30Ω

7 0

3 years ago

True or False. Alfred Wegener contributed greatly to the theory of plate tectonics by collecting and analyzing fossil, glacial a

bearhunter [10]

Answer:

The Answer would be True

Explanation:

8 0

2 years ago

Read 2 more answers

A circular loop of wire with area A lies in the xy-plane. As viewed along the z-axis looking in the −z-direction toward the orig

Sedaia [141]

Answer:

A) μ^ = - IA•k

B) Bx = 2D/IA

C) By = 4D/IA

D) Bz= -14D/(IA)

Step-by-step explanation:

We are given;

Torque; τ = D(2i^ − 4j^) Nm

Potential energy; U =− μ•B

Magnitude of magnetic field;

Bo = 15D/IA

a. The vector magnetic moment of the current loop is given as

μ^ = - μ•k

μ^ = -IA •k

b. Now, let's find the component of the magnetic field B.

If we assume B = Bx•i + By•j + Bz•k

Then, torque is given as

τ = μ^ ×B

τ = - IA •k × (Bx•i + By•j + Bz•k)

Note that;

i×i=j×j×k×k=0

i×j=k. j×i=-k

j×k=i. k×j=-i

k×i=j. i×k=-j

Then,

τ = - IA •k × (Bx •i + By •j + Bz •k)

τ= -IABx•(k×i) - IABy•(k×j) - IABz•(k×k)

τ= -IABx•j + IABy•i

τ= IABy•i - IABx•j

The given torque is τ = D(2i^ − 4j^)

Comparing coefficients;

Then,

-IABx = -4D

Bx = -4D/-IA

Bx = 4D/IA

c. Also,

IABy = 2D

Then, By= 2D/IA

d. To get Bz, let's use the magnitude of magnetic field Bo

Bo² = Bx² + By² + Bz²

(15D/IA)²=(4D/IA)²+(2D/IA)² + Bz²

Bz² = (15D/IA)²- (4D/IA)²- (2D/IA)²

Bz² = 225D²/(I²A²) - 16D²/(I²A²) - 4D²/(I²A²)

Bz² = (225D² - 16D²- 4D²)/I²A²

Bz² = 205D²/I²A²

Bz = √(205D²/(I²A²))

Bz = ± 14D/(IA)

So we want to determine if Bz is positive or negative

From the electric potential,

U=− μ•B

U= -(- IA k•(Bx i+By j+Bz k)

Note, -×- = +, i.i=j.j=k.k=1

i.j=j.k=k.i=0

Then,

U= IA k•(Bx i+By j+Bz k)

U = IABz

Since we are told that U is negative, then this implies that Bz is negative

Then, Bz= -14D/(IA)

7 0

3 years ago

Which factors affect the strength of the electric force between two objects

iris [78.8K]

By definition, the electric force is given by:

$f = k * \frac{q1q2}{d ^ 2}$

Where,

q1: electric charge of object number 1.

q2: electric charge of object number 2.

d: distance between both objects

k: proportionality constant

Therefore, the magnitude of the electric force is affected by:

1) The product of the charges of the objects

2) The distance between objects

Answer:

The factors that affect strength of the electric force between two objects are:

1) The product of the charges of the objects

2) The distance between objects

5 0

4 years ago

Read 2 more answers