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A 20-ohm resistor and a 2-farad capacitor are in series with a 9-volt battery. What is the initial current when the circuit was first assembled? What is the current after 50 seconds?
A 10 g bullets is fired into a 1200 g wood block that hangs from a 1.5 m long string. The bullet embeds itself into the block, and the block then swings out to an angle of 40 degrees. What is the s
A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m), as shown. At an instant when q = 50°, the tension in the string is 7.0 N. What is the magnitude of the re
A pirate's treasure chest lies 20.0 m below the surface of the ocean. What is the magnitude of the force that acts on the rectangle top that is 0.750 m x 0.425 m?
Using the position of the bob at its lowest point as the reference level, determine the total mechanical energy of the pendulum as it swings back and forth.
An object with a height of 39 is placed 1.5 in front of a concave mirror with a focal length of 0.49 ...Find the location of the image produced by the mirror using the mirror and magnification equa
The total electric flux from a cubical box 30.0 cm on a side is 1.65 × 103 N·m2/C. What charge is enclosed by the box?
A record turntable is rotating at 33 1/3 rev/min. A watermelon seed is on the turntable 7.2 cm from the axis of rotation. Calculate the acceleration of the seed, assuming that it does not slip.
What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of its average velocity during this trip?
A ceiling fan is turned on and a net torque of 1.4 N · m is applied to the blades. The blades have a total moment of inertia of 0.23 kg · m2.
What are the magnitude and direction of the vertical force (use up as the positive direction) exerted by the pole on the firefighter?
The ratio of the kinetic energy to the potential energy of a certain object of mass m at a height of 40 m above ground level is 2:1. What is the speed of the object at the point?
An astronaut applies a force of 500 N to an asteroid, and it accelerates at 7.00 m/s2. What is the asteroid's mass?
A ball of mass m makes a head-on-elastic collision with a second ball (at rest) and rebounds with a speed equal to one-fourth its original speed. What is the mass of the second ball?
A device used in radiation therapy for cancer contains 1.00 g of cobalt (59.933 819 u). The half-life of is 5.27 yr. Determine the activity of the radioactive material.
An object is 9 cm high and is located p = 29.2 cm in front of a thin diverging lens of focal length f = -18 cm. Calculate the position (distance from the center of the lens) and the height of its i
The rms electric field of an electromagnetic wave increases from 286 to 858 N/C. (a) Determine the wave intensities for the two values of the electric field.
So you decide to move closer to give the conversation a sound level of 60.0 rm {dB} instead. How close should you come?
Mackinzie walks 4 blocks west, then 2 blocks south, 4 blocks east, and finally, 1 block south. What is the magnitude of her total displacement during this walk (in blocks)?
The velocity of point P with respect to the ground has the same magnitude (v) as the linear velocity of the car. Find the ratio H/R.
An m=1 kg tetherball is swinging in a horizontal circle around a pole attached with an l=1.2m long massless rope. It makes an angle of 40 degrees with the pole. Find the x and y components of the te
The radius which joins the hill to flat terrain is 0.960 rad. The radius of each wheel is 0.400 meters. What is the angle (in radians) through which each tire rotates?
A square, single turn coil 0.20m on a side is placed with its plane perpendicular to a constant magnetic field. An emf of 18mV is induced in the coil winding when the area of the coil decreases at
Calculate the capacitance of a parallel plate capacitor whose plates are 20 cm x 30 cm and are separated by a 1.0 mm gap. What is the charge on each plate if the capacitor is connected to a 12 V bat
Find the tangential speed of a point that is 0.0410 meters from the center of the disk. (b) What is the magnitude of the centripetal acceleration at this point?