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AysviL [449]
3 years ago
14

By how many times will the kinetic energy of a body increases if its speed is trippled? Show by calculation.​

Physics
1 answer:
Lemur [1.5K]3 years ago
4 0

Answer:

6 times

Explanation:

You might be interested in
lens is to be used to allow this eye to clearly focus on objects 25 cm in front of it. What should be the focal length of this l
ser-zykov [4K]
<h2>Question: </h2>

The nearpoint of an eye is 151 cm. A corrective lens is to be used to allow this eye to clearly focus on objects 25 cm in front of it. What should be the focal length of this lens?

Answer:

29.96cm

Explanation:

Using the corrective lens, the image should be formed at the front of the eye and be upright and virtual.

Now using the lens equation as follows;

\frac{1}{f} = \frac{1}{v} + \frac{1}{u}   -------------(i)

Where;

f = focal length of the lens

v = image distance as seen by the lens

u = object distance from the lens

From the question;

v = -151cm        [-ve since the image formed is virtual]

u = 25cm

Rewrite equation (i) to have;

f = \frac{uv}{u+v}

Substitute the values of v and u into the equation;

f = \frac{25*(-151)}{25-151}

f = \frac{-3775}{-126}

f = 29.96cm

The focal length should be 29.96cm

4 0
3 years ago
A toaster is plugged into a 132 volt household circuit it draws the amps of current If you use a toaster 2 hours a week how much
Ne4ueva [31]
There is a missing data in the text of the problem: the current drawn is 0.5 A (found on internet)

Solution:
The power used by the toaster is the product between the voltage V and the current I:
P=VI=(132 V)(0.5 A)=66 W=0.066 kW

The toaster is used for a time of 2 hours: t=2h, therefore the energy used is equal to
E=Pt =(0.066 kW)(2 h)=0.132 kWh
8 0
3 years ago
What is the net magnetic flux through any closed surface?
Paul [167]

Answer:

The net magnetic flux through any closed surface must always be zero.

3 0
3 years ago
this is a 3 part questionOn vacation, your 1400-kg car pulls a 560-kg trailer away from a stoplight with an acceleration of 1.85
mamaluj [8]

ANSWER:

(a) 1036 N

(b) -1036 N

(c) 2590 N

STEP-BY-STEP EXPLANATION:

Given:

Mc = 1400 kg

Mt = 560 kg

a = 1.85 m/s^2

(a)

Force by car on trailer:

\begin{gathered} F_c=m\cdot a \\ F_c=560\cdot1.85 \\ F_c=1036\text{ N} \end{gathered}

(b)

\begin{gathered} F_t=-F_c \\ F_t=-1036\text{ N} \end{gathered}

(c)

\begin{gathered} F_n=1400\cdot1.85 \\ F_n=2590\text{ N} \end{gathered}

3 0
1 year ago
A nonprofit organization posted an article in the local newspaper about a recent marathon. The marathon raised money for vaccina
mr Goodwill [35]

Answer:

An original funding source.

Explanation:

Non profit organization planned a marathon through which the money was raised for the vaccinations help, hence; here they are showing the original funding source, that is the number of runners and the amount raised by them.

3 0
3 years ago
Read 2 more answers
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