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1. An object can have constant speed without constant velocity, but it can't have constant velocity without constant speed. Explain.
2. You are wearing sandals and running across a plaza. The phone "pager" you are wearing on your hip falls off and lands on your toes painfully. How could this have happened? Shouldn't the pager have fallen behind you where it would have presented no danger to your feet?
3. If a person stands on a stool, his weight is a downward force of a certain size. The stool pushes up with a force. Are they of equal size and oppositely directed? Are they an action-reaction force pair? Elaborate.
4. A large truck and a Volkswagen "bug" have a head-on crash. Answer the following questions, and explain your answers.
a. Which vehicle experiences the larger impact force.
b. Which vehicle experiences the larger acceleration?
A 3.7 kg box is sliding down a surface that is inclined downwards by 30° below the horizontal. How much energy of the box has been lost
On average, each person in the industrialized world is responsible for the emission of 10,000 kg of carbon dioxide () every year. This includes that you generate directly, how long would each edge of the cube be
For the description of motion in two dimensions one may use Cartesian coordinates (x(t), y(t)), or plane polar coordinates (r(t), γ(t)), where x(t)=r(t)cos(γ(t)) and y(t)= r(t)sin(γ(t)). Rewrite the kinetic energy T= 1/2 m(x'^2+y'^2) in plane polar c..
When a 58-g tennis ball is served, it accelerates from rest to aspeed of 44 m/s. The impact with theracket gives the ball a constant acceleration over a distance of42 cm. What is the magnitude of the netforce acting on the ball?
A pipe is horizontal and carries oil that has a viscosity of 0.15 Pa · s. The volume flow rate of the oil is 5.8 10-5 m3/s. What is the absolute pressure at the input end
A cardinal (Richmondena cardinalis) of mass 3.60×10-2 and a baseball of mass 0.146 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of baseball's momentum.
question the current-density magnitude in a certain circular wire is j 2.60 times 1010 am4r2 where r is the radial
The Sun radiates energy at a rate of about 4×1026W. At what rate is the Sun's mass decreasing
Find the moment of inertia of a solid uniform sphere of radius R which has a spherical cavity of radius R/2. The spherical cavity is centered at a point R/2 from the center of the sphere. Take the axis of rotation to go through the center of the sphe..
two workers hold a heavy pail. its mass is unknown. one worker exerts a 220n force at 137 degrees from vertical. the
What do you mean by the concept of energy in physics? Is the energy has any physical significance in the daily life of a common man? Please explain this concept in easy points
an aluminum rod is 18.5 cm long at 20 C and has a mass of 350g. if 15000 J of energy is added to the rod by heat, what is the change in lenghth of the rod
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