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If the cube floats so that it is 70% in the water and 30% in the oil, what is the mass of the cube? What is the buoyant force on the cube?
The edge of the raft is against the shore of the lake. The man walks toward the shore, the entire length of the raft. How far from the shore does the raft move?
A bottle containing 2kg of water at a temp. of 20°C is placed in refrigerator where the temperature is kept at 5°C. How much heat is transferred from the water to cool it to 5°C?
There are 6.3 multiplied by 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb B1 is 0.01 mm2 (1 mm2 = 1 multiplied by 10-6 m2). The electr
The on axis magnetic field strength 5 cm away from a magnetic dipole is 1.0x 10000000 T . Wht is the size of magnetic dipole moment
A rectangular barge, 8 m long and 2 m wide, floats in fresh water. Find how much deeper it floats when its load is a 400 kg horse.
Describe your local and surrounding ecologies and environments. List the specific factors that distinguish your local ecology and environment.
An object weighing 346 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 310 N. Immersed in oil, the object weighs 325 N. Calculate the density
Does,doubling the distance between an individual and the source of radiation reduces the radiation exposure to one-fourth the original value.
Suppose in the figure that I1 = I2 = 24 A and that the separation between the wires is 0.015 m. What is the magnitude of the external field?
A player bounces a 0.34-{rm kg} soccer ball off her head, changing the velocity of the ball from initial velocity. If the ball is in contact with the player's head for 6.7 {rm ms}, what is the directi
A compass needle points 25 degrees E of N outdoors. However, when it is placed 17 cm to the east of a vertical wire inside a building it points 61 degrees E of N. What is the magnitude of the curren
Calculate the tension in a horizontal string that whirls a 2kg toy in a circle of radius 2.5m when it moves at 3 m/s on an icy surface.
A 3.0 cm tall object is 15 cm in front of a converging lens that has a 75 cm focal length. Calculate the image position and height. Compare with your ray-tracing in part a.
A rocket ship at rest in space gives a short blast of its engine, firing 90 kg of exhaust gas out the back end with an average velocity of 700 m/s. (a) What is the change in momentum of the rocket d
What is the frequency heard by a passenger in a car traveling at 67 km/h in the oncoming lane to the fire truck at the following times?
To give a 18-{rm kg} child a ride, two teenagers pull on a 3.6-{rm kg} sled with ropes, as indicated in the figure . Both teenagers pull with a force of 55 {rm N} at an angle of 35 ^circ relative t
At what angle of incidence should one of them shine a flashlight on the mirror so that the reflected beam directly strikes the other person?
A 770 kg car moving at 21 m/s brakes to a stop. The brakes contain about 15 kg of iron, which absorbs the energy. What is the increase in temperature of the brakes?
What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.5 mm and the light has a wavelength of 515 nm?
A 529- physics student stands on a bathroom scale in an 859- (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 487. Find the magnitude of
A molecule of DNA (deoxyribonucleic acid) is 2.02 m long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and com
What is the radius of curvature of a concave mirror that magnifies by a factor of +3.5 an object placed 24 cm from the mirror?
The average intensity of solar radiation incident on the upper atmosphere of the Earth is 1390 W/m2. Assuming that the Sun emits radiation uniformly in all directions, determine the total power rad
A 48 kg skier starts from rest at a height of H = 27 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 28° with the horizontal. Neglect the effe