Physics Answers

consider a copper of mass 50kg at a temp 10 degree celcius and a copper calorimeter of mass 15kg with water to weigh 4okg. when heat energy is supplied to the calorimeter until the temp reaches 50 degree celcius. find the specific heat capacity of the copper.(given that the s.h.c of water = 4200 and copper = 400) initial temp of calorimeter is 54 degree celcius

1. Several environmental scientists are monitoring the movement of a cheetah on an Ethiopian plain. They find that at t = 5 min, the cheetah is traveling at 5 m/s due west. At t = 15 min, it is moving at 12 m/s toward the west, while at t = 30 min it is moving at 2 m/s toward the east. If we call western movement positive, when is the cheetah’s speed negative? A) During the entire interval from t = 15 to t = 30 min B) Only during part of the interval from t = 15 to t = 30 min C) During at least part of the interval from t = 15 to t = 30 min, and possibly at other times D) Never, since speed is not a vector quantity

Each of the respective electric fields at a point P due to charges 𝑄1 and 𝑄2 are as follows:

𝑄1 is E1 = 20i + 50j -30k N/C

𝑄2 is E2 = -20i - 60j +30k N/C

If a point charged body A having a charge 𝑄3 = 2C and mass m = 2 kg is placed at point P,

calculate:

a) The electric force acting on the point charged body, neglecting gravity?

b) If gravity is considered as g = 10j 𝑚/𝑠𝑒𝑐

2

, calculate the initial acceleration of the point

charged body A when placed at point P?

A man rides up in an elevator 12 m.He gains 6500 J of potential energy.What is the man's mass?

The principle violated by the following electronic configuration.

1s(2)2s(6)3s(2)

(10%)  Problem 10:   A jet dives vertically at a speed v = 170 m/s, before pulling out of the dive along a circular arc. The pilot can survive an acceleration of a = 8.9 g. His mass is m = 81 kg.

What would be the magnitude of the normal force, in newtons, be at the top of an arc of this radius going the same velocity?

A damped harmonic oscillator is described by the solution of the

differential equation

(d^2y/dt^2)+2beta(dX/dT)+w^2*y=0

An observer determines that the amplitude of the oscillator decreases

by 18.0% in 50.0 seconds, which is much longer than the oscillation

period of the damped oscillator.

How long will it take for the energy of the oscillator to be reduced to

half its original value?

1. Several environmental scientists are monitoring the movement of a cheetah on an Ethiopian plain. They find that at t = 5 min, the cheetah is traveling at 5 m/s due west. At t = 15 min, it is moving at 12 m/s toward the west, while at t = 30 min it is moving at 2 m/s toward the east. If we call western movement positive, when is the cheetah’s speed negative? A) During the entire interval from t = 15 to t = 30 min B) Only during part of the interval from t = 15 to t = 30 min C) During at least part of the interval from t = 15 to t = 30 min, and possibly at other times D) Never, since speed is not a vector quantity

2. If the coefficient of friction between vehicles and the road is 0.4 and the radius of curvature of

a circular curve of the road is 30 m. What is the maximum speed allowable if there is no

banking?

1. Given the potential and actual supply and demand situation,will there be a lot of opportunities open for your existing or envisioned enterprise in the future?

2. What are they?

3. How attractive are these opportunities?

4. What are the major threats to the supply and demand situation in the future?