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Explain what type of energy both objects have just before they are released. Do both objects initially have the same amount of energy? Explain what type of energy both objects have just before they
Unpolarized light is incident on a series of two Polaroid sheets. The intensity of the light emerging from the second sheet is 18.4% of the intensity of the light incident on the first sheet. Find
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speed of the planets are determined to be 43.3 km/s and 58.6 km/s. The slower planet's
A plane leaves the airport in Galisto and flies 170 at 68.0 east of north and then changes direction to fly 230 at 48.0 south of east, after which it makes an immediate emergency landing in a pastu
Determine the maximum weight of the bucket that the wire system can support so that no single wire develops a tension exceeding 0.5 kN. Assume that the system is in equilibrium.
A 0.400-kg object attached to the end of a string of length 0.500 m is swung in a circular path and in a vertical plane. If a constant angular speed of 8.00 rad/s is maintained, what is the tension
Suppose you are 90 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.5 mm.
Drawing on Eratoshthenes' method, if two observers are due north and south of each other and are seperated by 400 km, what is the circumference of their spherical world if they see the same star on
25g of copper pellets are removed from a 300 degree C oven and immediately dropped into 80 mL of water at 23 degree C in an insulated cup. What will the new water temperatures be?
a 430-g soccer ball at rest on the ground is kicked with a force of 600 n and flies off at 15 m/s. How long was the toe of the person who kicked the ball?
Pete slides a crage up a ramp at an angle of 30 degrees by exerting a 225-N force parallel to the ramp. The crate moves at constant speed. The coefficient of fricition of .28. How much work has bee
A 20 times telescope has a 12-{rm cm}-diameter objective lens. What minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source?
A piece of string 5.30 m long has a mass of 14.0 g. What must the tension in the string be to make the wavelength of a 128 Hz wave 120.0 cm?
Calculate the electrical attraction that a proton in a nucleus exerts on an orbiting electron if the two particles are 1.41×10-10 apart.
A house is 49.0 ft long and 30 ft wide, and has 8.0-ft-high ceilings. What is the volume of the interior of the house in cubic meters and cubic centimeters?
A 29 kg chair initially at rest on a horizontal floor requires a 373 N horizontal force to set it in motion. Once the chair is in motion, a 342 N horizontal force keeps it moving at a constant veloci
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20^circ {rm C}? Assume that the air bubble is always in thermal equilibrium with the surroun
A proton orbits a long charged wire, making 2.00 times 10^{6} revolutions per second. The radius of the orbit is 1.40 cm. What is the wire's linear charge density
A woman rides a carnival Ferris wheel at radius 20 m, completing 4.7 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceler
The electric field at a point in space is E_vec = ( 200 hat{ i }+ 400 hat{ j } ) ;{rm N}/{rm C}. What is the x-component of the electric force on a proton at this point?
A copper kettle contains water at 24 0 C. When the water is heated to its boiling point the volume of the kettle expands by 1.2 x 10 - 5 m 3. Determine the volume of the kettle at 24 0 C.
Silver bar 0.25 meter long is subjected to a temperature change from 200 degrees C to 100 degree C. What will be the length of the bar after the temperature change?
On an essentially frictionless ice rink, a skater moves at 3 m/s. They encounter a rough patch of ice (with friction) that reduces their speed by 45% due to a friction force that is 25 % of their we
A mass m is gently placed on the end of a freely hanging spring. The mass then falls 32.4 cm before it stops and begins to rise. What is the frequency of the oscillation?
It takes 3.0 {mu {rm J}} of work to move a 15 {rm nC} charge from point A to B. It takes -6.0 {mu {rm J}} of work to move the charge from C to B. What is the potential difference V_{rm{C}} - V_{rm{A