5. A student places a rectangular rubber eraser on a leather-bound book, and begins to tilt the book. If the coefficient of friction between leather and rubber is 0.61, at
what angle will the eraser first start to slide?
O A. 24°
8.32
OC.38
D. 52

The chemical effect of the endocrine system is longer lasting than the chemical effect of the nervous system. select the best answer from the choices provided t f

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.