# Sebastian Acosta

Physics teacher | Verified Expert

I hold a degree in Physics from Clarkson University, where I honed my passion for unraveling the mysteries of the universe. With a penchant for inquiry and discovery, I thrive on guiding students through the complexities of physics. My journey from Clarkson has equipped me with a deep understanding of theoretical concepts and practical applications. From classical mechanics to quantum theory, I am committed to fostering a deeper appreciation for the wonders of physics. With tailored approaches and engaging strategies, I aim to inspire curiosity and instill confidence in every student I teach. Let's explore the universe together.

## Questions

The position of an object moving along a line is given by #p(t) = 2t^3 - 2t +2#. What is the speed of the object at #t = 4 #?

A ball with a mass of #140 g# is projected vertically by a spring loaded contraption. The spring in the contraption has a spring constant of #42 (kg)/s^2# and was compressed by #5/6 m# when the ball was released. How high will the ball go?

A charge of #8 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #38 J# to #14 J#, what is the voltage between points A and B?

Three forces act on a point: 3 N at 0°, 4 N at 90°, and 5 N at 217°. What is the net force?

An open pipe has a length of 0.75 m. What would be the length of a closed organ pipe whose third harmonic(n=3) is the same as the fundamental frequency of the open pipe?

How much work does it take to raise a #2 kg # weight #9 m #?

What is the kinetic energy of an object with a mass of #2 kg# that has been in freefall for #7 s#?

How much work does it take to raise a #14 kg # weight #2 m #?

An object with a mass of #4 kg#, temperature of #261 ^oC#, and a specific heat of #18 (KJ)/(kg*K)# is dropped into a container with #39 L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?

What is the momentum of a 3-kg object moving at 5 m/s?

At a construction site a pipe wrench struck the ground with a speed of 24m/s. (a) From what height was it inadvertently dropped? (b) How long was it falling?

A person 1.80 m tall stands in front of a plane mirror. What is the minimum height of the mirror, and how high must its lower edge be above the floor for the person to be able to see his/her whole body? Person’s eyes are 6.0 cm below the top of the head.

An object with a mass of #4 kg# is on a plane with an incline of #pi/12 #. If the object is being pushed up the plane with #9 N # of force, what is the net force on the object?

A circuit with a resistance of #9 Omega# has a fuse melts at #6 A#. Can a voltage of #8 V# be applied to the circuit without blowing the fuse?

An object's two dimensional velocity is given by #v(t) = ( t^2 +2 , cospit - 3t )#. What is the object's rate and direction of acceleration at #t=2 #?

When both the current and voltage in a circuit are doubled, what happens to resistance and power?

An object travels North at # 7 m/s# for #6 s# and then travels South at # 3 m/s# for # 8 s#. What are the object's average speed and velocity?

What is the unit vector that is normal to the plane containing #(3i + 4j - k)# and #(2i+ j - 3k)#?

A model train with a mass of #1 kg# is moving along a track at #24 (cm)/s#. If the curvature of the track changes from a radius of #144 cm# to #360 cm#, by how much must the centripetal force applied by the tracks change?

An object with a mass of #5 kg# is pushed along a linear path with a kinetic friction coefficient of #u_k(x)= xe^x-x #. How much work would it take to move the object over #x in [1, 4], where x is in meters?