Physics Answers

a 4.5 kg dog stands on an 18 kg flatboat at distance D ! 6.1 m from the shore. It walks 2.4 m along the boat towardshore and then stops. Assuming no friction between the boat and the wa-ter, find how far the dog is then from the shore.

Starting from rest, you travels to north between t=0s, t=5s with an acceleration 0.4 m/s^2. Next you drive to east between t=5s and t=10s with an acceleration of 1 m/s^2. Then you drives south between t=10s and t=20s with an acceleration of 0.6 m/s^2. What is your position and velocity after 20 s?

The specific gravity of aluminum is 2.7. Find its density in kg/m³.

Write the Given, Required and Solution. Express your final answer

in proper significant figure.

A 0.5 kg of air is compressed reversibly and adiabatically from 80 kPa and 60°C to 0.4 MPa and is then expanded at constant pressure to the original volume. Sketch the process on p-V and T-S diagrams, compute work transfer, heat transfer and change in entropy for whole path

The emission spectrum of the atoms of a given

element is determined by [

(A) the mass of electron.

(B) the mass of proton.

• (C) the mass of neutron.

(D) the energy levels between the initial orbit and

final orbit during transition.

Which of the following is NOT TRUE about MRI? [

• (A) ×, y, and z axis are applied with a magnetic field

gradient.

(B) The time parameters T1 and T2 of the NMR signal

are needed to construct an MRI image.

(C) NMR signals are produced by highly energetic

collision of high-speeded free electrons.

(D) MRI does not produce the same radiation effect

on the living system as X-rays CT.

Leaving the distance between the 253 kg and the 604 kg masses fixed, at what distance from the 604 kg mass (other than infinitely remote ones) does the 39 kg mass experience a net force of zero?

What is degree of freedom at normal temperature.

What is reflection.

What is lagrangian.