# Elena Albarran

Physics teacher | Verified Expert

With a Physics degree from the University of West Florida, I'm passionate about unraveling the mysteries of the universe. As a dedicated tutor, I bring clarity to complex concepts, making physics accessible to all. My goal is to ignite curiosity and foster understanding in every student I work with. Let's embark on a journey of discovery together!

## Questions

A force field is described by #<F_x,F_y,F_z> = < xy , 2z-y^2 +x, 2y -zx > #. Is this force field conservative?

An object with a mass of #60 g# is dropped into #800 mL# of water at #0^@C#. If the object cools by #30 ^@C# and the water warms by #15 ^@C#, what is the specific heat of the material that the object is made of?

A ball with a mass of #125 g# is projected vertically by a spring loaded contraption. The spring in the contraption has a spring constant of #8 (kg)/s^2# and was compressed by #3/5 m# when the ball was released. How high will the ball go?

A ball with a mass of #125 g# is projected vertically by a spring loaded contraption. The spring in the contraption has a spring constant of #8 (kg)/s^2# and was compressed by #2/5 m# when the ball was released. How high will the ball go?

An electric toy car with a mass of #3 kg# is powered by a motor with a voltage of #7 V# and a current supply of #5 A#. How long will it take for the toy car to accelerate from rest to #4 m/s#?

How fast will an object with a mass of #3 kg# accelerate if a force of #27 N# is constantly applied to it?

What is the speed of an object that travels from #( 6, -3, 1) # to #(-1,5,-1 ) # over #4 s#?

John uses a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. The pulley is 50% efficient. How much work must be done to lift the sail? How much work must John do on the rope to lift the sail?

What torque would have to be applied to a rod with a length of #5 m# and a mass of #2 kg# to change its horizontal spin by a frequency of #9 Hz# over #6 s#?

What is the equation for Snell's law?

A box with an initial speed of #4 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #4/3 # and an incline of #(3 pi )/8 #. How far along the ramp will the box go?

What is the dot product of #<5,-3,6 ># and #<-8,2,-9 >#?

If a #7/2 kg# object moving at #9/4 m/s# slows to a halt after moving #3/8 m#, what is the coefficient of kinetic friction of the surface that the object was moving over?

A container with a volume of #6 L# contains a gas with a temperature of #270^o K#. If the temperature of the gas changes to #330 ^o K# without any change in pressure, what must the container's new volume be?

Please solve with a detailed explanation?

A charge of #35 C# passes through a circuit every #5 s#. If the circuit can generate #14 W# of power, what is the circuit's resistance?

How can convection help to cool your body?

What happens to mass at speeds near that of light?

A spring with a constant of #9 (kg)/s^2# is lying on the ground with one end attached to a wall. An object with a mass of #2 kg# and speed of #3 m/s# collides with and compresses the spring until it stops moving. How much will the spring compress?

A wrench with a length of #54 cm# is being used to unscrew a #6 cm# bolt. If a torque of #90 Nm# is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?