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A crate with a weight of 50N rests on a horizontal surface. A person pulls horizontally on it with a force of 10N and it does not move. To start it moving, a second person pulls vertically upward on the crate. If the coefficient of static friction is 0.4, what is the smallest vertical force for which the crate moves?
A sinusoidal electromagnetic wave emitted by a cellular phone has a wavelength of 34.0cm and an electric-field amplitude of 4.30×10?2v/m at a distance of 200m from the antenna. Calculate the magnetic-field amplitude
an 8.17g bullet is fired into a 325g block that is initially at rest at the edge of a table of h 1.06 m height.a the
An 8 lb weight stretches a spring 4ft, the system resides in amedium offering a resistance to the motion equal to 1.5 times theinstantaneous velocity, if the weight is released at a position 2ftabove its equilibrium position with downward velocity of..
A plano convex lens is placed convex side down on a plane glass plate and illuminated from the above with red loght of wavelength of 625nm. what are the curvature and focal length of the convex surface of the lens
a duck has a mass of 2.6 kg. as the duck paddles a force of 0.11 n acts on it in a direction due east. in addition the
A woman who can row a boat at 7.3 km/h in still water faces along, straight river with a width of 6.8 km and a current of 3.3km/h. Let point directly across the river and point directly downstream. If she rows in a straight lineto a point directly..
A light ray is incident from air onto the surface of a very quiet lake. what is the index of refraction of the water
A motorcycle is traveling up one side of a hill and down the other side. Determine the maximum speed that the cycle can have while moving over the crest without losing contact with the road
A girl delivering newspapers covers her route by traveling 4.00 blocks west, 4.00 blocks north, and then 6.00 blocks east. What is the total distance she travels
In each of the following cases, the mass is 32.0 kg and the radius is 7.50 cm. (a) What is the moment of inertia (kg m2) of a solid cylinder rotating about an axis parallel to the symmetry axis but passing through the edge of the cylinder? (b) What i..
The current in a 100 watt lightbulb is 0.770 A. The filament inside the bulb is0.190 mm in diameter, What is the current density in the filament
A person walks in the following pattern: 9.8 km north, then 1.6 km west, and finally 7.0 km south. Construct the vector diagram that represents this motion and from it judge how far and in what direction a bird would fly in a straight line from th..
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