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Physics 101 Mechanics Q&A Archive of November 26, 2021

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November 26 of 2021

Find the resultant velocity on the particle at O
the two runners have the same mass are running along a line in oposite directions with speed v. what is the kinetic energy of the system consisting both runners? a. 0 b. 1/2 mv^2 c. mv^2 d. 2mv^2 e. 4 mv^2
which of the following forces cannot do work under any circumstances a. kinetic force b. static force c. tension d. normal force e. none of the aboves
a box initially on the shelf at a height h is pushed out of the shelf and allowed to fall to the ground. But imagine that before pushing the box off, we have attached it to a spring anchored to the shelf that stretches vertically as the box fall. We observe that the vertical velocity of the…
Suppose that a box initially on the shelf at a height h is pushed out of the shelf and allowed to fall to the ground. Taking the box and the earth to be the system, the change in its kinetic energy is a. zero b. the work done by gravity c. the change in its potential energy d. negative…
A proton is accelerated in a cyclotron from rest to 4.8 ? 106 m/s in 0.07 s. The proton follows a circular path. If the radius of the cyclotron is 0.4 km, answer the following. (a)
you lift a box of mass m from the ground placing them it at rest on a shelf at a height h. Taking the box to be the system, the work done by gravity is a. mgh b. zero c. - mgh d. equal to the work you did to put it on the shelf e. equal to the change in the total energy of the box
Each of two small non-conducting spheres is charged positively, the combined charge being 40 ?C. When the two spheres are 50 cm apart, each sphere is repelled from the other by a force of magnitude 2.0 N. Determine the magnitude of the smaller of the two charges.
A mechanical part is given in the first coordinate system (x1-y1-z1) with all dimensions shown in the following diagram. A through hole is designed at its centre with a radius of 0.3. The second coordinate system is established at the centre of the top plane of the part. Its y2-axis is…
A .32-caliber bullet fired from a revolver with a 3-in.-long barrel will have a relatively low muzzle speed of about 200 m/s. If it's shot straight up, neglecting air resistance: (a) what is the peak height the bullet will reach? (b) How fast will it be moving when it returns to the height of…
Physics 101 textbook
A crude model of the human vocal tract treats it as a pipe closed at one end. Find the effective length of the vocal tract in a person whose fundamental tone is 620 Hz. Sound of speed in air at body temperature is 354 m/s.
A 1000 kg car traveling due east at speed 20.0 m/s collides head-on with a 1500 kg light truck traveling due west at speed 10.0 m/s. a. If 50% of the car and truck system’s kinetic energy is converted to internal energy during the collision, what are the final velocities of the car and truck?…
Can anyone help me solve this i need to submit it in 4 hours
I. Torque 1. A force is being applied on a machine given by the vector \( \vec{F}=10 N \hat{\imath}-5 N \hat{\jmath} \). The position vector from the axis of rotation to the point where the force is applied is \( \hat{r}=-0.5 \mathrm{mi}+0.5 \mathrm{~m} \hat{\jmath} \). a. Sketch the force…
the following data are for a simple steam power plant as shown in figure
What is the air speed velocity
A. A point mass m moves frictionlessly on a horizontal plane. An unusual, anharmonic spring with unstretched length r0 is attached between a pivot at the origin and the mass. Let the radial force exerted by the spring be given by Fr = -c(r - r0)^3 where c is a positive constant. Using plane…
Determine the moments of inertia of the shaded area shown with respect to the x-axis and y-axis when a=20 mm. (10 Marks
3. Engineers are designing a system by which a falling mass m imparts kinetic energy to a rotating uniform drum to which it is attached by thin, very light wire wrapped around the rim of the drum (Fig. P9.68). There is no appreciable friction in the axle of the drum, and everything starts from…
1. Calculate the moment of inertia of a uniform solid rod using integration.
2. A meter stick with a mass of 0.180 kg is pivoted about one end so it can rotate without friction about a horizontal axis. The meter stick is held in a horizontal position and released. As it swings through the vertical, calculate (a) the change in gravitational potential energy that has…
Rope A is tied to block 1, and rope B is attached to both block 1 and block 2 as shown in the diagram. Block 1 has a mass of 4.2 kg and block 2 has a mass of 2.6 kg. You lift both blocks straight up. Calculate the magnitude of tension in each of the ropes when the blocks Move at constant…
Find the resultant velocity on the particle at O
the two runners have the same mass are running along a line in oposite directions with speed v. what is the kinetic energy of the system consisting both runners? a. 0 b. 1/2 mv^2 c. mv^2 d. 2mv^2 e. 4 mv^2
which of the following forces cannot do work under any circumstances a. kinetic force b. static force c. tension d. normal force e. none of the aboves
a box initially on the shelf at a height h is pushed out of the shelf and allowed to fall to the ground. But imagine that before pushing the box off, we have attached it to a spring anchored to the shelf that stretches vertically as the box fall. We observe that the vertical velocity of the…
Suppose that a box initially on the shelf at a height h is pushed out of the shelf and allowed to fall to the ground. Taking the box and the earth to be the system, the change in its kinetic energy is a. zero b. the work done by gravity c. the change in its potential energy d. negative…
A proton is accelerated in a cyclotron from rest to 4.8 ? 106 m/s in 0.07 s. The proton follows a circular path. If the radius of the cyclotron is 0.4 km, answer the following. (a)
you lift a box of mass m from the ground placing them it at rest on a shelf at a height h. Taking the box to be the system, the work done by gravity is a. mgh b. zero c. - mgh d. equal to the work you did to put it on the shelf e. equal to the change in the total energy of the box
A mechanical part is given in the first coordinate system (x1-y1-z1) with all dimensions shown in the following diagram. A through hole is designed at its centre with a radius of 0.3. The second coordinate system is established at the centre of the top plane of the part. Its y2-axis is…
A .32-caliber bullet fired from a revolver with a 3-in.-long barrel will have a relatively low muzzle speed of about 200 m/s. If it's shot straight up, neglecting air resistance: (a) what is the peak height the bullet will reach? (b) How fast will it be moving when it returns to the height of…
Physics 101 textbook
A 1000 kg car traveling due east at speed 20.0 m/s collides head-on with a 1500 kg light truck traveling due west at speed 10.0 m/s. a. If 50% of the car and truck system’s kinetic energy is converted to internal energy during the collision, what are the final velocities of the car and truck?…
Can anyone help me solve this i need to submit it in 4 hours
the following data are for a simple steam power plant as shown in figure
What is the air speed velocity
A. A point mass m moves frictionlessly on a horizontal plane. An unusual, anharmonic spring with unstretched length r0 is attached between a pivot at the origin and the mass. Let the radial force exerted by the spring be given by Fr = -c(r - r0)^3 where c is a positive constant. Using plane…
Determine the moments of inertia of the shaded area shown with respect to the x-axis and y-axis when a=20 mm. (10 Marks
3. Engineers are designing a system by which a falling mass m imparts kinetic energy to a rotating uniform drum to which it is attached by thin, very light wire wrapped around the rim of the drum (Fig. P9.68). There is no appreciable friction in the axle of the drum, and everything starts from…
1. Calculate the moment of inertia of a uniform solid rod using integration.
2. A meter stick with a mass of 0.180 kg is pivoted about one end so it can rotate without friction about a horizontal axis. The meter stick is held in a horizontal position and released. As it swings through the vertical, calculate (a) the change in gravitational potential energy that has…
Rope A is tied to block 1, and rope B is attached to both block 1 and block 2 as shown in the diagram. Block 1 has a mass of 4.2 kg and block 2 has a mass of 2.6 kg. You lift both blocks straight up. Calculate the magnitude of tension in each of the ropes when the blocks Move at constant…