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A rock is suspended by a light string. When the rock is in air, the tension in the string is 39.1 N. When the rock is totally immersed in water, the tension is 28.9 N. When the rock is totally immersed in an unknown liquid, the tension is 18.4 N. What is the density of the unknown liquid?
A car (m = 1510 kg) is parked on a road that rises 18° above the horizontal. find the static frictional force that the ground exerts on the tire
When a carbon dioxide molecule attaches to a molecule of hemoglobin, the bond that forms between them immediately starts vibrating. What is the vibration frequency of the bond if the carbon dioxide molecule has speed of 2.42 m/s
Nathan walks due east a certain distance and then walks due south twice that distance. He finds himself 15 km from his starting position
Transverse waves travel at 20.8 m/s on a string that is under a tension of 7.00 N. What tension is required for a wave speed of 30.8 m/s in the string
A research group plans to construct an engine that extracts energy from the ocean, using the fact that the water temperature near the surface is greater than the temperature in deep water. what is the maximum efficiency such an engine could have
A man strikes a long aluminum rod at one end. Another man, at the other end with his ear close to the rod, How long is the rod
A 220 g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.150 s. If the total energy of the system is 3.50 J.
A 32.2 uF capacitor is connected to a 50.2 ohm resistor and a generator whose rms output is 37.2 V at 50.0 Hz. Calculate the rms current in the circuit. Calculate the phase angle for the circuit
A bag of intravenous (iv) infusion is help up at 80 cm above the level of patient's veion, What is the downward force of the saline solution on the clot at the tip of the catheter
A system of 1402 particles, each of which is either an electron or a proton, What is the mass of this system
A ball traveling with an initial momentum of 2.5 kg m/s bounces off a wall and comes back in opposite direction with a momentum of -2.5 kg m/s. What is the change in momentum of the ball
What mass (in grams) of steam at 100°C must be mixed with 377 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 58.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, ..
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