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Physics 101 Mechanics Q&A Archive of October 30, 2021

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October 30 of 2021

I take a walk and start by going 4 km NW, followed by 3 km S and finally turn E for 7 km. Use the component method to determine the distance & direction I would have to walk in to return to my starting point.
Define acceleration. To avoid squishing a kitty which had strayed onto the road, the driver of an 18 wheeler slams on the brakes and reduces his speed from 80 km/hr to zero in 12 seconds. What is the truck’s average acceleration in m/s2 ?
A railroad locomotive is pulling two passenger cars along a level track with an acceleration of 1m/s2 . If the mass of the first car is 15000 Kg and the mass of the second car with the bar in it is 25000Kg, find the tension in the coupling joining the locomotive to the first car and also…
You are driving too fast along a straight horizontal road one winter when you hit a patch of ice and slam on the brakes. If your car with you in it has a mass of 1500 Kg an you were initially travelling at 25m/s and the coefficient of friction between the icy road and your tires is 0.2, how far…
An object mass M initially at rest is acted upon by a force F=k,i+k2 t3 j,where k and k2 are constants. calculate the velocity of the object as a function of time
Suppose the mass of the bullet, the mass of the block, and the height of the block’s swing have the same values as above. If the bullet goes all the way through the block and emerges with one-third its initial velocity, what was its initial speed?
11 Suppose, rather than throwing a ball, you throw a lump of clay with mass 0.45 kgkg and initial velocity 30 m/s. When it hits the wall, the lump of clay sticks to the wall. Find the average force exerted on the wall by the lump of clay if it comes to a stop in 0.010 s.
If the neutron's kinetic energy is reduced to 49/64 of its initial value in a single collision, what is the mass of the moderator nucleus?
At the instant described, the cat decides to avoid combat. It quickly turns around and runs in the ?x?x direction with speed 1.2 m/sm/s. Find the position of the center of mass at this instant.
Vector R has a magnitude of 36 units directed 30° from the +y – axis of a Cartesian plane. What are the x- and y-components of the vector?
Vector R has a magnitude of 36 units directed 30? from the +y – axis of a Cartesian plane. What are the x- and y-components of the vector?
A boy kicks a box, giving it a speed of 6.0 m/s. The box slows down to a stop after travelling a distance of 3.0 m. What is the acceleration of the box?
An object moves with uniform acceleration. Its velocity increases from10 m/s to 20 m/s in a distance of 75 m. The object continues its motion with the same acceleration. What is the distance travelled by the object when its velocity increases from 20 m/s to 40 m/s?
Two dimensions. In the figure, three point particles are fixed in place in an xy plane. Particle A has mass mA = 3 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three particles. What (a) x coordinate and…
I take a walk and start by going 4 km NW, followed by 3 km S and finally turn E for 7 km. Use the component method to determine the distance & direction I would have to walk in to return to my starting point.
Define acceleration. To avoid squishing a kitty which had strayed onto the road, the driver of an 18 wheeler slams on the brakes and reduces his speed from 80 km/hr to zero in 12 seconds. What is the truck’s average acceleration in m/s2 ?
A railroad locomotive is pulling two passenger cars along a level track with an acceleration of 1m/s2 . If the mass of the first car is 15000 Kg and the mass of the second car with the bar in it is 25000Kg, find the tension in the coupling joining the locomotive to the first car and also…
You are driving too fast along a straight horizontal road one winter when you hit a patch of ice and slam on the brakes. If your car with you in it has a mass of 1500 Kg an you were initially travelling at 25m/s and the coefficient of friction between the icy road and your tires is 0.2, how far…
Suppose the mass of the bullet, the mass of the block, and the height of the block’s swing have the same values as above. If the bullet goes all the way through the block and emerges with one-third its initial velocity, what was its initial speed?
11 Suppose, rather than throwing a ball, you throw a lump of clay with mass 0.45 kgkg and initial velocity 30 m/s. When it hits the wall, the lump of clay sticks to the wall. Find the average force exerted on the wall by the lump of clay if it comes to a stop in 0.010 s.
If the neutron's kinetic energy is reduced to 49/64 of its initial value in a single collision, what is the mass of the moderator nucleus?
At the instant described, the cat decides to avoid combat. It quickly turns around and runs in the ?x?x direction with speed 1.2 m/sm/s. Find the position of the center of mass at this instant.
Vector R has a magnitude of 36 units directed 30° from the +y – axis of a Cartesian plane. What are the x- and y-components of the vector?
Vector R has a magnitude of 36 units directed 30? from the +y – axis of a Cartesian plane. What are the x- and y-components of the vector?
Two dimensions. In the figure, three point particles are fixed in place in an xy plane. Particle A has mass mA = 3 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three particles. What (a) x coordinate and…