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The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.1 m/s. Neglect nonconservative forces, such as friction and air resistance, and find the height h of
A 41-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 160 J from 450 J. How high does she rise during this
At a height of 14 m, his speed is 5.2 m/s. His mass, including the propulsion unit, has the approximately constant value of 135 kg. Find the work done by the force generated by the propulsion unit.
Juggles rises to a height of 3.2 m above the ground, at which point he has the same amount of gravitational potential energy as Bangles had before he jumped, assuming both potential energies are mea
A person pushes a 24.5-kg shopping cart at a constant velocity for a distance of 39.8 m on a flat horizontal surface. She pushes in a direction 22.4 ° below the horizontal. A 50.7-N frictional f
An electron with speed of 3.00X10^5 m/s moves into a uniform electric field of magnitude 4.00X10^3 N/C. The field is parallel to the electron's motion. How far will the electron travel before its sp
You need to design a 60.0-Hz ac generator that has a maximum emf of 5600 V. The generator is to contain a 170-turn coil that has an area per turn of 0.96 m2. What should be the magnitude of the mag
A fully charged 7.1uF capacitor is connected in series with a 2.0×10^5 Omega resistor. What percentage of the original charge is left on the capacitor after 1.7s of discharging?
A series combination of four identical resistors is across a battery. The potential difference across each resistor is 2.0V, and the circuit current is 0.22A. a) Find the value of each resistor.
Express your answer using two significant figures. yearly cost = B) Suppose your refrigerator uses 300 of power when it's running, and it runs 8 hours a day. What is the yearly cost of operating you
During a 78-ms interval, a change in the current in a primary coil occurs. This change leads to the appearance of a 7.8-mA current in a nearby secondary coil. The secondary coil is part of a circuit
A rectangular loop of wire that is 55 cm wide and 20 cm long is placed in a region where the magnetic field is B = 0.4 T. Suppose the wire loop lies in the x-y plane and that the magnetic field make
A sample of ideal gas with gamma factor 1.4 occupies a volume of 1.5 L. The gas undergoes an isochoric heating raising the pressure from 100 kPa to 300 kPa. What is the change in the internal energy
This simplified example illustrates the principle of ballistocardiography, but in practice a more sophisticated model of heart function is used. grams?
A 65 kg person throws a .045 kg snowball forward with a speed of 30 m/s. a second person with a mass of 60 kg catches the snowball. Both are at rest. What happens to the first skater?
Two particle of charge q1 and q2 are separated by distance d. The net electric field due to the particles is zero at x=d/4. With V=0 at infinity, located ( in terms of d) any point on x axis (other
The electron's acceleration is due to two electric forces parallel to the x axis: = 9.22 x 10-17 N, and , which points in the -x direction. Find the magnitudes of (a) the net force acting on the ele
A 65 kg person throws a .045 kg snowball forward with a speed of 30 m/s. a second person with a mass of 60 kg catches the snowball. both people are on skates.
Calculate the full width on the screen of the central maximum of the diffraction pattern.
Which of the following statements about the speed and acceleration of the cart just before the counterweight hits the ground is true?
To what temperature must this combination be cooled to separate the two metals if the aluminium rod were 10.05 cm in diameter?
A Styrofoam box has a surface area of 0.88 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 27°C. If it takes 7.4 h for 5.0 kg
Calculate the allowable internal design pressure at 72% design factor for an 18 in. pipeline, wall thickness 0.375 in. and pipe material API 5LX-46. What is the hydrotest pressure range for this pip
In a heart pacemaker, a pulse is delivered to the heart 81 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 2.3 x 106. One pulse is delivered every
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. A defibrillator passes 15 A of current through the torso of a person in 2.3 ms. (a) How much charge