3. A 15.0 kg block is pushed up a 35° incline. The coefficient of friction between the block and the incline is 0.480. What minimum force would be needed to move the block up the incline
at a constant speed? (4 marks)
4. A child pulls an 8.50 kg toboggan across the sidewalk by exerting a 60.0 N force in the
direction shown. The coefficient of friction between the toboggan and sidewalk is
0.520. What is the acceleration of the toboggan? (5 marks)

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.