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A 2.50 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.90 N and a vertical force P are then applied to the block (see the figure). The coefficients of friction for the block and surface are s = 0.4 and k = 0.25. Decide the magnitude of the frictional force acting on the block if the magnitude of P is (a) 6.00 N and (b) 10.0 N.
Three charges q = 0.160 C form an equilateral triangle, 1.50 m on a side. Using energy that is supplied at the rate of 0.63 kW, how many days would be needed to move one of the charges to the midpoint of the line joining the other two charges?
At time t=0 s we throw a stone from the ground level straight up with a speed of 20m/s. at what time will the stone reach its highest point, and how high is it then above the ground?
A ray of red light, for which n=1.54 and a ray of violet light, for which n=1.59, travel during a piece of glass. They meet right at the boundary among the glass and the air, and emerge into the air as one ray with an angle of refraction of 22.5?. Wh..
A rotating object starts from rest at t = 0 s and has s constant angular acceleration. At a time t = 7.0 s the object has an angular velocity of omega = 16 rad/s. What is the angular velocity at time t = 14 s?
A cube of solid aluminium has a volume of 1.00 m3 at 20°C. What temperature change is needed to produce a 100 cm3 increase in the volume of the cube?
On a frictionless surface, a block of mass m1 and velocity v1 = vi is moving to the right when it collides with a spring, of spring constant k, attached to the left side of a stationary block of mass m2. Both blocks are free to slide on the surface.
A researcher is trying to shoot a tranquilizer dart at a 2.2-m -tall rhino that is 130m away. Its angular size as seen during the rifle telescope is 9.9? What is the magnification of the telescope?
A homemade capacitor is assembled with placing two 9 in pie pans 8 cm apart and connecting them to the opposite terminals of a 9 V battery. Estimate the capacitance. Estimate the charge on each plate. Estimate the electric field halfway among the pla..
Taking a code of ethics "off the wall and into the hall" can be a particular challenge for medium to large firms with a diverse array of employees.
The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft. What is the refractive power of this lens? What focal length (mm) eyepiece would give a magnification of 1000× for this telescope?
a uniform 5.93 m long horizontal beam that weighs 468N is attachedto a wall by a pin connection that allows the beam to rotate. itsfar end is supported by a cable that makes an angle of 51 degreeswith the horizontal, and a 582N person is standing 1.2..
A cyclotron designed to accelerate protons has a magnetic field of magnitude 0.470 T over a region of radius 1.40 m. What is the maximum speed acquired by the protons
Four identical metallic objects carry the following charges: +1.18, +6.89, -4.92, and -9.56C. The objects are brought simultaneously into contact, What is the final charge on each object
Oasis B is located 25 km east from oasis A. A camel starts from oasis A and travels 19.6 km in the direction 14.7 degrees south of east. Then it walks 8 km directly to the north. How far is the camel from oasis B?
A rod 89 cm long moves in a plane perpendicular to a magnetic field of 510. G. The velocity of the rod is perpendicular to its length. Find the speed of the rod
A block of mass mb is attached to one end of a spring and is sliding on a horizontal frictionless surface. the other end of the spring is fixed. find the new period and new amplitude of the motion
About 0.1eV is required to break a hydrogen bond in a protein molecule, what is the minimum frequecy that the radiation can have to accomplish that?
A small fly of mass 0.260 gram is caught in a spider's web. The web vibrates predominately with a frequency of 3.34 Hertz. Find the value of the effective spring constant k for the web
A 17.00 kg block is pushed up a frictionless inclined plane that makes an angle of ? = 33 o with the horizontal direction. What force is needed to move the block with constant speed
A 10cm*10cm*10cm block of steel (ρ steel =7900kg/m^3) is suspended from a spring scale. The scale is in nektons. What is the scale reading if the block is in air?
a 3500-kg vehicle moving east at 50 kmh collides head-on with a6000kg vehicle moving west at 40 kmh. the two vehicles
question1an airplane is flying horizontally with speed 1000 280 while an engine falls off. neglecting air resistance
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