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A worker drags a box along a frictionless horizontal floor by pulling on a rope attached to the box. The position of the box is given by x(t) = (1.500 m) + (3.650 m/s)t ? (0.300 m/s 2 )t 2 + (0.089 m/s 3 )t 3 . The box has a mass of 50.00 kg.
(a) What is the position of the box at t = 2.000 seconds?
(b) What is the velocity of the box at t = 2.500 seconds?
(c) What is the acceleration of the box at t = 3.000 seconds?
Three resistors, 19 ?, 60 ?, and 100 ?, are connected in series, and a 0.45-A current passes through them. find the potential difference across this equivalent resistance
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Use the table shown below to determine the energy in eV of the photon emitted when an electron jumps down
The aluminium wire in a high-voltage transmission line is 2.7 cm in diameter. It is designed to carry a current of 1100 A. What is the voltage drop across a 32-km-long segment of this power line?
A horizontal beam 4m long is attached to a vertical wall with a hinge at one end, and a body of weight 500N hangs from the outer end. The beam is supported with a guy wire from its outer end to the wall directly above the beam.
In brief explain the changes that the Sun will go through after it exhausts its core hydrogen. Be sure to describe both the changes occurring in the Sun's core and the changes visible from outside the Sun. What do we mean by the stages we call hydrog..
A bat crashes into the vertical front of an accelerating subway train. If the coefficient of friction between the bat and the trainis 0.86, what is the minimum acceleration of the train that willallow the bat to remain in place?
a 20 Kg block slides along a frictionless table at 20 m/s. What will be the final momentum and kinetic energy of the joined blocks
Write down all the physical principles about resistances and currents in simple circuits containing resistors. Also write down all the physical principles about resistances and currents in simple circuits containing resistors connected in parallel
During a game of football, the ball is kicked by the punter with a speed of 20m/s at an angle of 40 degrees above the horizontal. A player on the other team, standing 50m away, starts running to catch the ball immediately after it is kicked. ASsu..
Determine an angle (in radians) through which the drill rotates during this period.
A 2.5kg cannonball is fired from the top of a cliff. The cannonball leaves the cannon at a height of h=75 m above the ground below. what is the speed of the cannonball just before it hits the ground
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