The density of ice is 0.917 g/om’. The latent heat for melting ice is 33 1/g Let us model a sewing needle as a cylinder with a small diamcter. Provide a reasonable estimate of the cross-sectional area of this needle. Provide an estimate of the temperature of an ice cube just removed from the freezer of a standard refrigerator. Also provide a reasonable estimate of the force that a person would apply to this heedle if he or she attempted to push it into an ice cube. (a) (b) Using your numbers from pat ln), determine if the ice will melt under the tip of the needle as the person attempts to push it into the ice cube. (Recall dP/dT As AV)

Write an essay (1,500-1,750 words) in which you will explore cognitive effort and skill acquisition. In your essay, include the following:
A statement demonstrating the impact of cognitive effort on practice. An empirical examination of whether cognitive effort is important or necessary for motor skill acquisition.
An empirical examination of whether cognitive effort is important or necessary for motor skill acquisition.
A statement explaining how the learning environment could be manipulated to increase cognitive effort.

What is the length of the day in Chico on the Summer Solstice? The latitude of Chico is 39.73o and the earth’s rotational axis is inclined at 23.5o towards the sun. Hint: Chico’s daily path is a circle with a portion of its circumference in the night’s darkness. View the orbit from the side (in cross section) and then also from the top (in cross section) and that will give you enough information to deduce just what fraction that dark portion must be of the whole journey. Since once around represents 24 hours you will know what fraction of that time must be dark.