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A piece of chalk is thrown vertically upward and caught during its descent at the same height from which it was thrown. Position is measured from the location of the chalk when it left the hand. The positive direction for position, velocity, and acceleration is upward
What are the signs of the position, velocity, and accelerationduring the descending part of the trajectory?
POSITION VELOCITY ACCELERATION
(A) Positive Positive Positive
(B) Positive Positive Negative
(C) Positive Negative Negative
(D) Negative Positive Negative
(E) Negative Negative Negative
A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. What is the speed of the car just before it lands safely on the other side
The New River Gorge bridge in West Virginia is a 518 meter long steel arch. Determine how much will its length change between temperature extremes -15°C and 31°C
Four point charges, each with Q = 8.8 µC, are arranged at the corners of a square of edge length 1.4 m. What is the electric potential at the center of the square
The ball starts from rest at an initial position xi and moves under the influence of the force to a final position xf. What is the kinetic energy of the ball when it reaches final positon xf.
The diagram shows the forces involved in lifting a heavy object of mass L with the arms. If the weight of the object is L=300N and assuming the centre of gravity of the trunk is 2/3 of the way up the spine between the lumbosacral joint and the arm..
A thin, circular disk of radius R = 30 cm is oriented in the yz-plane with its center as the origin. Calculate the magnitude of the electric field due to the disk at the point x = 15 cm along the x-axis
In the railroad freight yard, an empty freight car of massm rolls along a straight level track at 1.1 m/s and collides with an initially stationary,fully loaded boxcar of mass 3.9m.The two cars couple together upon collision.
A spherical mirror is polished on both sides. When used as a convex mirror, the magnification is +1/7. Find the magnification when used as a concave mirror
A 0.0346 kilogram bullet is fired horizontally into a 3.67 kilogram wooden block attached to one end of a mass less, horizontal spring (k = 860 N/m). Find what is the speed of the bullet
A simple pendulum consists of a ball connected to one end of athin brass wire. evaluate the change in the period of the heated pendulum
A vessel which contains an ice-water mixture at 0C is in thermal contact with a water-steam mixture at 100 C. What is the change in the entropy of the water-steam mixture at 100C
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is = 1.72 × 109 W/m2. What is the rms value of (a) the electric field and (b) the magnetic field in the electromagnetic wave emitted by the laser.
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