Weight and g: A 2.10-kg hammer is transported to the Moon. The radius of the Moon is 1.74 × 106 m, its mass is 7.35 × 1022 kg, and G = 6.67 × 10-11 N ? m2/kg2. How much does the hammer weigh on Earth and on the Moon?
What will be an ideal response?
20.6 N (on Earth), 3.40 N (on the Moon)
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A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion?
I. The total momentum of the fragments is equal to the original momentum of the firecracker. II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker. A) Statement I only B) Statement II only C) Both Statement I and Statement II D) Neither statement is true.
A rectangular plate in plane stress is subjected to normal stresses ?x and ?y and shear stress txy. Stress ?x is known to be 15 MPa, but ?y and txy are unknown. However, the normal stress is known to be 33 MPa at counterclockwise angles of 358 and 758 from the x axis. Based on this, the normal stress ?y on the element in the figure is approximately:
(A) 14 MPa
(B) 21 MPa
(C) 26 MPa
(D) 43 MPa
When a body moves in circular motion at constant speed, the velocity and acceleration point __________
Fill in the blank(s) with correct word
When you and your snowboard are in motion, which of the following can be zero?
A) momentum B) kinetic energy C) mass D) inertia E) none of the above