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A 62-kg girl weighs herself by standing on a scale in an elevator. What does the scale read when: the elevator is descending at a constant rate of 12 m/s?
That is a nice amount of time in pleasant company but perhaps a painful string of microseconds in unpleasant company. How many microseconds are in 2 fortnights?
A worker pushes a 500 N weight wheelbarrow up a ramp in length and inclined at 20 degrees with the horizontal. What potential energy does the wheelbarrow experience?
IP A 0.450kg block of wood hangs from the ceiling by a string, and a 7.00×10^-2 kg wad of putty is thrown straight upward. Is the mechanical energy of this system conserved?
A solid cylindrical disk has a radius of 0.15 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 50-N force is applied tangentially to the disk,
Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of
What is the equilibrium temperature of this system? If your answer is 0° C, determine the amount of water that has frozen.
A 2.8 kg block of wood sits on a table. A 3.0g bullet, fired horizontally at a speed of 490 m/s, goes completely through the block, emerging at a speed of 190 m/s .
A simple pendulum consists of a bob of mass 1.8kg attached to a string of length of 2.5m. The pendulum is held at an angle of 30 degrees from the vertical by the light horizontal string attached to
The other a capacitance of 4.5 µF. These two capacitors together store 6.0 10-5 C of charge. What is the voltage of the battery?
A space station is constructed in the shape of a wheel 16 rm m in diameter, with essentially all of its 6.0×105 rm kg mass at the rim. Once the station is completed, it is set rotating at a ra
A 19 kg loudspeaker is suspended 2.0 m below the ceiling by two cables that are each 10 degrees from vertical.what is the tension of the cable?
A uniform rod 10ft long and weighing 30 pounds is supported in a horizontal position on a fulcrum with weights of 40 and 50 pounds suspended from its ends. Compute the position of the fulcrum.
Sam, a train engineer, blows a whistle that has a frequency of 5.0 102 Hz as the train approaches a station. If the speed of the train is 33 m/s, what frequency will be heard by a person at the stat
A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path?
A spool of wire of mass 5.3 kg and radius 0.73 m is unwound under a constant wire tension 14 N. Assume the spool is a uniform solid cylinder that rolls without slipping. Find the friction force on the
Find the magnitude and direction of the electric force that acts on the particle. Find the magnitude and direction of the electric field that the particle experiences.
A computer disk is 8.0 cm in diameter. A reference dot on the edge of the disk is initially located at theta=45 degrees. The disk accelerates steadily for 0.50 s, reaching 2000 rpm, then coasts at
A long wire which is coaxial with the cylinder carries an equal current in the same direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
Two vertical, long, straight wires each carry a current of 5.40 A in the upward direction and are separated by 18.4 cm. Find the resultant magnetic field at a point P midway between the wires.
a meteor whose mass was about 1.9*10^8 kg struck earth (mE=6.0*10^54 kg) with a speed of about 19 km/s and came to rest in the earth what is the earth's recoil speed?what fraction of the meteor's ki
A height of 4m above the ground. if the arrow is relased from a height of 1m above the ground and hits the apple .50s later, what is the arrow's initial velocity?
A ranger in a national park is driving at 49 km/h when a deer jumps onto the road 66 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of
a 10 meter long vine that is at 53o with the vertical and swings off the branch. What is the tension in the vine when it makes an angle of 30o with the vertical?
Susan's 11.0 baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled above the floor. The tension is a constant 29.0 and the coefficient of friction is 0.20