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Question1
A student who weighs 490 N is wearing a backpack that weighs 88 N. The student is standing still on level ground. Give the answers to the following questions in Newton's.
(a) What is magnitude of the net force on the student?
(b) What is magnitude of the contact force on the student by the backpack?
(c) What is magnitude of the contact force on the student by the ground?
Question2
A small rock with mass 0.20 kg is released from rest at point A, that is at the top edge of a large, hemispherical bowl with radius R = 0.50 m. suppose the size of the rock is small compared to R, and assume the rock slides rather than rolling. The work done by friction on the rock when it moves from point A to point B at the bottom of the bowl is -0.22 J. What is a speed of the rock when it reached point B?
What is the moment of inertia of the disk for rotation about an axis through the edge of the disk
An electron is accelerated through a potential difference of 100 V, Find the radius of the circular path in which it will travel
The electrons in the beam of a television tube have a kinetic energy of 3.26 × 10-15 J. What is the acceleration of an electron due to this field component
Mass 1 is a 15.0 g marble sliding to the left with a velocity of magnitude 0.72 m/s on the frictionless, Calculate the momentum of the marbles before the collision
A thin rod of length 0.75 m and mass 0.35 kg is suspended freely from one end. It is pulled to one side and then allowed to swing like a pendulum, Find the rod's kinetic energy at its lowest position
A hiker walks 3.50 km at an angle of 45.0 degrees north of west. After that the hiker walks 1.5 km south. What is the magnitude and direction of hiker's totally displacement.
A 5.0 ? resistor is connected in series with another resistor and a 5.0 V battery. The current in the circuit is 0.70 A. Calculate the value of the unknown resistance
A wire is 1.50 m long and has a diameter of 1.50 mm. The tensile modulus of the wire is 6.20 x 1010 N/m2. what is the increase in length of the wire
A blood transfusion is being set up in an emergency room for an accident victim. What is the distance h above the victim's arm where the level of the blood in the transfusion bottle should be located
A skier of mass 106 kg travels down a frictionless ski trail. If the top of the trail is a height 206 m above the bottom, what is the work done by gravity on the skier
A proton moves in a circular path perpendicular to a 1.19 T magnetic field. Calculate the energy of the proton in eV
A small ball is doing circular motion around a pole. The string connecting the pole and the ball is 30 degrees (?) away from the pole. Find the linear speed of the ball
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