Home
Ask directory
Physics 101 Mechanics
October 2021
16

Physics 101 Mechanics Q&A Archive of October 16, 2021

Select Question

October 16 of 2021

A scooter and rider together have a mass of 275 kg. If the scooter slows with an acceleration of - 4.5 m/s^2, what is the magnitude of the net force on the scooter and rider?

You and a friend are trying to slide a couch across the rug. Using concepts of friction and normal force - will it be easier to slide the couch if you lift up or push down as you move?

Once the piano is sliding, a force of 850 N is needed to keep the 4700 N piano moving. What is the coefficient of kinetic friction between the piano and the floor?

A piano weights 4700 N. What force is needed to start the piano slidding across the horizontal floor when the coefficient of friction between the piano legs and the floor is 0.23?

Find the weight of a 1350 kg automobile on the moon where the gravitational acceleration is 1.62 m/s^2.

Find the weight of a 1350 kg automobile on Earth (in Newtons).

Why for a circular orbit we should choose an initial velocity tangential to the orbit

1. Find the resultant force vector R. (you can use “paint” to indicate and draw the resultant force vector R)

Use Newton’s law of universal gravitation to calculate the weight of a 75-kg person standing on the surface of the earth. Then repeat the calculation by using W = mg and compare your two results.

What is meant by space in four fundamental quantities involved in Newton’s Laws? Give several examples and explain in no more than 200 words.

an object moves along x-axis with a speed of 6m/s for 2 second, then moves against the x-axis with a speed of 12m/s for 2 second, and then moves along the x-axis with a speed of 16m/s for 2 second what is its speed?

The intensity of sunlight at the Earth is about 1367 W/m^2. How many times further away would the Sun have to be from the Earth before solar radiation was only as intense as a 100W light bulb 10 meters away, assuming that all energy from the bulb goes into radiation and spreads out evenly in…

A gas canister is filled with 4.5 liter H2 gas to a pressure of 1 bar at 25oC. The gas is heated to 500oC. Calculate the pressure (in bar) inside the canister at 500oC

classical dynamics of particles and systems

Find the transformation matrix that rotates the axis x3 of a rectangular

matrix ?

C. A technisian is \( 40.75 \mathrm{~m} \) fram a radio tower and \( 8.25 \mathrm{~m} \) from another radio tower, on what would be the 3 rd nodal line. Do to facily materials one tower is emiting an electromagnete planned frequency. Calculate a) The speod of the waves. b) The infended…

\( [5 \mathrm{marks}] \) QLFSTION? FICARRE2.2 FIGURE \( 2.2 \) shoms one cnd of a horizontal spring \( \left(k=80.0 \mathrm{~N} \mathrm{~m}^{-1}\right) \) is hek fiued while an exlcmul force is. appliod to the froe end, stretching it slowly from \( x-0 \) to \( x=400 \mathrm{~cm} \). (a)…

An object moves along the x-axis with a speed of 6 m/s for 2 seconds, then moves against the x-axis with a speed of 12 m/s for 2 seconds, and then moves along the x-axis with a speed of 16 m/s for 2 seconds What is its speed? A. 10m/s B.14m/s c. 8m/s d. 5m/s

One end of a horizontal spring (k 80 N/m) is held fixed while an external force is applied to the free end, stretching it slowly from xf 0 to xg=4.0 cm. a) Find the work done by the external force on the spring. b) Find the additional work done in stretching the spring from xB = 4.0 cm to xc =…

A 50 g particle that can move along the x-axis experiences the net force Fx=2.0t2N, where t is in s. The particle is at rest at t = 0 s.

A passenger in a bus notices that a ball which has been at rest in the aisle suddenly starts to roll toward the front of the bus. What can the passenger conclude about the motion of the bus from his observation?

In a head-on collision between a compact hybrid car and a gas-guzzling SUV, why are people in the smaller car more likely to get injured than those in the large one, assuming that both cars are equally strong?

In a head-on collision between a compact hybrid car and a gas-guzzling SUV, (a.) which vehicle is acted upon by the greater force? (b.) So why are people in the smaller car more likely to get injured than those in the large one, assuming that both cars are equally strong?

The distorted after deformation shape of the rectangle is shown in the figure. Determine: a) The normal strain \( \varepsilon_{x} \) and \( \varepsilon_{y} \) at D b) The shear strain \( \gamma_{x y} \) at corners \( D \) and \( C \) c) The normal strain along the diagonal DB

A scooter and rider together have a mass of 275 kg. If the scooter slows with an acceleration of - 4.5 m/s^2, what is the magnitude of the net force on the scooter and rider?

You and a friend are trying to slide a couch across the rug. Using concepts of friction and normal force - will it be easier to slide the couch if you lift up or push down as you move?

Once the piano is sliding, a force of 850 N is needed to keep the 4700 N piano moving. What is the coefficient of kinetic friction between the piano and the floor?

A piano weights 4700 N. What force is needed to start the piano slidding across the horizontal floor when the coefficient of friction between the piano legs and the floor is 0.23?

Find the weight of a 1350 kg automobile on the moon where the gravitational acceleration is 1.62 m/s^2.

Find the weight of a 1350 kg automobile on Earth (in Newtons).

Why for a circular orbit we should choose an initial velocity tangential to the orbit

1. Find the resultant force vector R. (you can use “paint” to indicate and draw the resultant force vector R)

Use Newton’s law of universal gravitation to calculate the weight of a 75-kg person standing on the surface of the earth. Then repeat the calculation by using W = mg and compare your two results.

What is meant by space in four fundamental quantities involved in Newton’s Laws? Give several examples and explain in no more than 200 words.

an object moves along x-axis with a speed of 6m/s for 2 second, then moves against the x-axis with a speed of 12m/s for 2 second, and then moves along the x-axis with a speed of 16m/s for 2 second what is its speed?

The intensity of sunlight at the Earth is about 1367 W/m^2. How many times further away would the Sun have to be from the Earth before solar radiation was only as intense as a 100W light bulb 10 meters away, assuming that all energy from the bulb goes into radiation and spreads out evenly in…

A gas canister is filled with 4.5 liter H2 gas to a pressure of 1 bar at 25oC. The gas is heated to 500oC. Calculate the pressure (in bar) inside the canister at 500oC

classical dynamics of particles and systems

Find the transformation matrix that rotates the axis x3 of a rectangular

matrix ?

C. A technisian is \( 40.75 \mathrm{~m} \) fram a radio tower and \( 8.25 \mathrm{~m} \) from another radio tower, on what would be the 3 rd nodal line. Do to facily materials one tower is emiting an electromagnete planned frequency. Calculate a) The speod of the waves. b) The infended…

\( [5 \mathrm{marks}] \) QLFSTION? FICARRE2.2 FIGURE \( 2.2 \) shoms one cnd of a horizontal spring \( \left(k=80.0 \mathrm{~N} \mathrm{~m}^{-1}\right) \) is hek fiued while an exlcmul force is. appliod to the froe end, stretching it slowly from \( x-0 \) to \( x=400 \mathrm{~cm} \). (a)…

An object moves along the x-axis with a speed of 6 m/s for 2 seconds, then moves against the x-axis with a speed of 12 m/s for 2 seconds, and then moves along the x-axis with a speed of 16 m/s for 2 seconds What is its speed? A. 10m/s B.14m/s c. 8m/s d. 5m/s

One end of a horizontal spring (k 80 N/m) is held fixed while an external force is applied to the free end, stretching it slowly from xf 0 to xg=4.0 cm. a) Find the work done by the external force on the spring. b) Find the additional work done in stretching the spring from xB = 4.0 cm to xc =…

A 50 g particle that can move along the x-axis experiences the net force Fx=2.0t2N, where t is in s. The particle is at rest at t = 0 s.

A passenger in a bus notices that a ball which has been at rest in the aisle suddenly starts to roll toward the front of the bus. What can the passenger conclude about the motion of the bus from his observation?

In a head-on collision between a compact hybrid car and a gas-guzzling SUV, (a.) which vehicle is acted upon by the greater force? (b.) So why are people in the smaller car more likely to get injured than those in the large one, assuming that both cars are equally strong?

The distorted after deformation shape of the rectangle is shown in the figure. Determine: a) The normal strain \( \varepsilon_{x} \) and \( \varepsilon_{y} \) at D b) The shear strain \( \gamma_{x y} \) at corners \( D \) and \( C \) c) The normal strain along the diagonal DB