# 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

Objects A and B are at the origin. If object A moves to #(0 ,-3 )# and object B moves to #(9 ,-3 )# over #3 s#, what is the relative velocity of object B from the perspective of object A? Assume that all units are denominated in meters.

How does acceleration change as a car increases speed?

What is the cross product of #[2, -1, 4]# and #[-1, 2, 2] #?

What is the cross product of #(2i -3j + 4k)# and #(- 5 i + 4 j - 5 k)#?

An object with a mass of #1 kg#, temperature of #350 ^oC#, and a specific heat of #14 J/(kg*K)# is dropped into a container with #16 L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?

What is the cross product of #<1,2,-4># and #<-1,-1,2>#?

A charge of #7 C# is at the origin. How much energy would be applied to or released from a # 5 C# charge if it is moved from # (6, 18 ) # to #(-5 ,-2 ) #?

A model train with a mass of #2 kg# is moving along a track at #36 (cm)/s#. If the curvature of the track changes from a radius of #6 cm# to #3 cm#, by how much must the centripetal force applied by the tracks change?

A charge of #-2 C# is at the origin. How much energy would be applied to or released from a # 4 C# charge if it is moved from # (7 ,5 ) # to #(3 ,-9 ) #?

A car is moving in the east direction with the velocity of 30.0 miles/hour. To avoid head on collision the breaks are applied and the car is brought to rest in 10.0s. Calculate the average acceleration of the car?

Two charges of # -6 C # and # 4 C# are positioned on a line at points # -6 # and # 9 #, respectively. What is the net force on a charge of # -1 C# at # 1 #?

A box with an initial speed of #3 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #8/7 # and an incline of #( pi )/4 #. How far along the ramp will the box go?

A model train with a mass of #8 kg# is moving along a track at #9 (cm)/s#. If the curvature of the track changes from a radius of #21 cm# to #120 cm#, by how much must the centripetal force applied by the tracks change?

A solid disk, spinning counter-clockwise, has a mass of #16 kg# and a radius of #3/7 m#. If a point on the edge of the disk is moving at #8/5 m/s# in the direction perpendicular to the disk's radius, what is the disk's angular momentum and velocity?

An object has a mass of #4 kg#. The object's kinetic energy uniformly changes from #144 KJ# to # 124KJ# over #t in [0, 6 s]#. What is the average speed of the object?

If an object with uniform acceleration (or deceleration) has a speed of #6 m/s# at #t=0# and moves a total of 4 m by #t=3#, what was the object's rate of acceleration?

Why do we draw a normal between the reflected ray and the incident ray? What does a normal represents??

A model train with a mass of #6 kg# is moving along a track at #8 (cm)/s#. If the curvature of the track changes from a radius of #3 cm# to #15 cm#, by how much must the centripetal force applied by the tracks change?

A box with an initial speed of #8 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #4/3 # and an incline of #( pi )/6 #. How far along the ramp will the box go?

A charge of #7 C# is at the origin. How much energy would be applied to or released from a # 9 C# charge if it is moved from # (-5, 1 ) # to #(2 ,-1 ) #?