1. two identical metal balls are
suspended by insulating
threads. both balls have the
same net charge. in this
problem, do not assume the
balls are point charges.
ball 1
ball 2
free-body diagram
for ball 1
free-body diagram
for ball 2
a. draw a separate free-body
diagram for each ball. label the forces to
indicate:
• the object exerting the force,
• the object on which the force is exerted,
• the type of force (gravitational, normal,
and
. whether the force is a contact or a non-
contact force.
b. suppose the charge on the second ball is reduced slightly, so that it is less than that on the
first ball.
predict whether the angle
that ball 1 makes with the
vertical will be greater
than, less than, or equal to
the angle that ball 2 makes
with the vertical. explain.
sketch your answer at right.
ball 1
ball 2
how does the free-body diagram for each ball in this case compare to the corresponding free
body diagram that you drew in part a? if the magnitudes or directions of any of the forces ar
different, describe how they differ.
c. predict what will happen if
the net charge on ball 2 is
reduced to zero. make a
sketch to illustrate your
answer.
ball 1
ball 2

Energy transformations are processes that convert energy from one type (e.g., kinetic, gravitational potential, chemical energy) into another. any type of energy use must involve some sort of energy transformation.energy must obey the laws of thermodynamics.thermodynamics is the study of how energy changes from one type to another. the laws of thermodynamics apply to energy and energy conversions.the first law of thermodynamics: main articleenergy cannot be created or destroyed (which is called the conservation of energy); however, it can be transformed from one type into another. in fact, every useful process transforms energy from one form to another. there are many different forms or types of energy. some examples of everyday energy transformations are: scenario energy conversions involvedrubbing hands together to make them warm kinetic energy to thermal energyusing a battery-powered flashlight chemical energy to electrical energy (in the battery)electrical energy to radiant energy (in the bulb)an object speeding up as it falls gravitational potential energy to kinetic energythe second law of thermodynamics: main articlesome forms of energy are more useful than others. using energy always makes it less useful, even though no energy is actually destroyed.kinetic energy and electricity are the most useful forms. these are "high-quality" because they can be transformed almost completely into any other type of energy. electricity, for example, can be easily used to generate heat (thermal energy) or light (radiant energy), break chemical bonds (chemical energy), move objects (kinetic energy), or lift objects (gravitational potential energy).the least useful form of energy is low-temperature thermal energy. it can still be converted back to a higher-quality form, but useful energy is always lost in this process. converting energy to a less-useful form and then trying to work backwards never gets 100% of the useful energy back.for example, when a car runs, the engine will become hot (thermal energy). the warmth of the engine does nothing to the car move or go faster. this wasted energy is an unavoidable by-product of converting the car's fuel (chemical energy) into movement ("high-quality" kinetic energy), however it can potentially be used for heating the cabin of the car to slightly increase overall energy efficiency. it is a challenge for all forms of power generation to minimize wasted energy and be as efficient as possible.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

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It's because 3 if it was 10 it wouldn't look right do it goes up to 4d