A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s. The top of this rise can be modeled as a circle of radius 4.1 m
The sled and occupant have a combined mass of 110 kg. If the coefficient of kinetic friction between the snow and the sled is 0.10, what friction force is exerted on the sled by the snow as the sled goes over the top of the rise?
What will be an ideal response?
Answer: 88 N
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Vision Problems: A farsighted person cannot see clearly objects that are closer to her eyes than 60.0 cm. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable her to comfortably see the objects at a distance of 25.0 cm from her eyes?
A. -42.9 cm, +2.33 diopters B. -42.9 cm, -2.33 diopters C. +42.9 cm, +2.33 diopters D. +42.9 cm, -2.33 diopters E. +60 cm, +42.9 diopters
Salt water is denser than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is
A) less. B) more. C) the same. D) Cannot be determined because we do not know the volume of the ship.
Account for the observation that ethyl alcohol, ImageImageOH, dissolves readily in water but dimethyl ether, CImageOCImage, which has the same number and kinds of atoms, does not
A) The hydrogens on the dimethyl ether surround the molecule, shielding the inner atoms from interacting with the water. B) Because the carbons arrange themselves in a straight line, the ethanol can interact more easily with more water molecules, thus increasing its solubility. C) The high electronegativity of the carbon-oxygen-carbon bond on dimethyl ether creates a strong dipole charge on the ends of the molecule, making it highly soluble in water. D) Because dimethyl ether lacks an -OH group, it is significantly less polar than is ethyl alcohol and is not readily soluble in water.
On a sunny day at the beach, the reason the sand gets so hot and the water stays relatively cool is attributed to the difference in which property between water and sand?
a. mass density b. specific heat c. temperature d. thermal conductivity