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2 years ago

15

In a Harry Potter movie, there is a big pendulum in the Great Hall that goes back and forth once every 18.9 s. What is the lengt

h of the pendulum (if it obeys Physics instead of magic)? (Unit = m)?

2 answers:

Art [367]2 years ago

8 0

Answer:

88.854

Explanation:

slavikrds [6]2 years ago

7 0

Answer:

88.67

Explanation:

think this is right

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Heat is best defined as

Scilla [17]

There can be someone who think answer should be B but temperature isn' proportional with heat. The formula is Q=m.c.t , so it isn't definetly temperature. So answer should be D. Because A and C connect with force etc.

7 0

2 years ago

Calculate the electric charge of the glass ball

-Dominant- [34]

Answer:

As per Coulomb's law we know that force between two charges is given as

F = \frac{kq_1q_2}{r^2}F=

r

2

kq

1

q

2

here we know that

q_1 = 2.5 \times 10^{-6} Cq

1

=2.5×10

−6

C

q_2 = -5.0 \times 10^{-6} Cq

2

=−5.0×10

−6

C

r = 0.0050 mr=0.0050m

now from above formula we will have

F = \frac{(9 \times 10^9)(2.5 \times 10^{-6})(5 \times 10^{-6})}{(0.0050)^2}F=

(0.0050)

2

(9×10

9

)(2.5×10

−6

)(5×10

−6

)

F = 4500 NF=4500N

so they will attract towards each other as they are opposite in nature with force F = 4500 N

4 0

2 years ago

A net force of 1.6×10−15 N acts on an electron over a displacement of 5.0 cm, in the same direction as the net force. (a) What i

Margaret [11]

Explanation:

It is given that,

Net force acting on the electron, $F=1.6\times 10^{-15}\ N$

Displacement, d = 5 cm = 0.05 m

(a) Let $\Delta E$ is the change in kinetic energy of the electron. It can be calculated using work energy theorem. Mathematically, it is given by :

$W=\Delta E$

$\Delta E=F\times d$

$\Delta E=1.6\times 10^{-15}\ N\times 0.05\ m$

$\Delta E=8\times 10^{-17}\ J$

(b) Initial speed of the electron, u = 0

Again using the work energy theorem as :

$E=\dfrac{1}{2}m(v^2-u^2)$

$E=\dfrac{1}{2}m(v^2)$

$v=\sqrt{\dfrac{2E}{m}}$

$v=\sqrt{\dfrac{2\times 8\times 10^{-17}}{9.1\times 10^{-31}}}$

$v=1.32\times 10^7\ m/s$

Hence, this is the required solution.

7 0

3 years ago

Suppose that you lift four boxes individually, each at a constant velocity. The boxes have weights of 18 N, 6.0 N, 9.0 N, and 12

cricket20 [7]

Explanation:

It is known that the relation between work and force is as follows.

w = $F \times d cos (\theta)$

where, $\theta$ = angle between the applied force and direction of movement of the object which is zero in this case. As, cos (0) = 1.

Therefore, d = $\frac{w}{F}$

(i) For w = 36 J, and F = 9 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{9 N}$

= 4 m

(ii) For w = 36 J, and F = 12 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{12 N}$

= 3 m

(iii) For w = 36 J, and F = 6 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{6 N}$

= 6 m

(iv) For w = 36 J, and F = 18 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{18 N}$

= 2 m

4 0

2 years ago

Which phase change is the result of particles moving more quickly? (2 points) liquid to gas liquid to solid gas to liquid gas to

Alexxandr [17]

Answer - Liquid to Gas

Liquid to gas is your answer. Remember, particles are hardly moving as a solid, and gradually increase in speed during phase changes. Solid>Liquid>Gas>Plasma

Solid being the slowest, Plasma the fastest.

<em>Hope this helps!</em>

4 0

2 years ago