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a man bring to work a 5.7kg box of decorations. Being lazy and tired, when he reaches the ramp outsideof his office, he attaches a (massless) rope to the box and drags it up the incline.
a) if he pulls at the 22.62 degree angle and the coefficient of static friction between the box and the ramp is .42, what is th minimum force does he must apply in order to make the box slide?
b) after pulling long enough to get the box going 3.4 m/s, he lets go of the rope. If the coefficient of kinetic friction between the box and the ramp is .2, how long does it take the box to stop? Please be my lifesaver.
A 1.00 kg glider on a horizontal air track is pulled by a string at an angle θ. The taut string runs over a pulley and is attached to a hanging object of mass 0.500 kg .
A father racing his son has two-fifths the kinetic energy of the son, who has three-fifths the mass of the father. The father speeds up by 1.0 m/s, What is the original speed of the son
A cubical box 20cm on a side is constructed from 1.5cm -thick concrete panels. What is the air temperature inside the box when the light is on if the surrounding air temperature is 20 ?C
The solid fuel of a 300.kg rocket travelling at 1.64x10^4 km/h is ignited to correct the rocket trajectory in mid-flight to Mars. what is the acceleration of the rocket (in m/s^2) at the start of this burn
question1the pulley of an ideal atwoods machine is given an upward acceleration a. find out an acceleration of each
A car with a total mass of 1.93 103 kg has wheels of radius 35.0 cm and moment of inertia 0.715 kg · m2. Find the car's rotational energy when the car is moving at a speed of 30.0 m/s
During a lunar eclipse, a picture of the moon (which has a diameter of 3.48×106 m and is 3.86×108m from the earth) is taken with a camera whose lens has a focal length of 305mm, What is the diameter of the image on the film
The work done by an engine equals one-half the energy it expels to a cooler at 0C. what is the temperature of the heater
One electron collides elastically with a second electroninitially at rest. After the collision, the radii of theirtrajectories are 1.00 cm and 3.10 cm. The trajectories are perpendicular to a uniform magnetic field ofmagnitude 0.0580 T.
On a hot summer day, the temperature of air in Arizona reaches 113°F. What is the speed of sound in air at this temperature? (Enter your answer to four significant figures. The speed of sound at 0°C is 331 m/s. Use the conversion 0°C = 273 K as neces..
A glider with mass m = 0.240 kg sits on a frictionless horizontal air track, connected to a spring with force constant k= 5.00 N/m. What must the initial displacement of the glider be if its maximum speed in the subsequent motion is to be 3.00 m/s
An automobile with 0.250 m radius tires travels 60,000 km before wearing them out. How many revolutions do the tires make
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