Collisions in Two Dimensions: A car (of mass 1500 kg) and a small truck (of mass 2000 kg) collide suddenly at right angles at an icy intersection. The car was originally traveling eastward at 20.0 m/s and the truck was traveling northward at 20.0 m/s just before the collision took place. What is the speed of the combined wreck just after the collision if the vehicles become enmeshed?
Fill in the blank(s) with the appropriate word(s).
14.3 m/s
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Equilibrium: Three objects are connected by weightless flexible strings as shown in the figure. The pulley has no appreciable mass or friction, and the string connected to the block on the horizontal bench pulls on it parallel to the bench surface. The coefficients of friction between the bench and the block on it are µs = 0.66 and µk = 0.325. You observe that this system remains at rest.(a) Find the mass of the hanging object A.(b) What is the magnitude of the friction force on the block on the bench?
Fill in the blank(s) with the appropriate word(s).
In the velocity selector shown in Active Figure 29.13, electrons with speed v 5 E/B follow a straight path. Electrons moving significantly faster than this speed through the same selector will move along what kind of path?
A rectangular plate in plane stress is subjected to normal stresses ?x and ?y and shear stress ?xy. Stress ?x is known to be 15 MPa, but ?y and ?xy 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
Which stars are more common?
A) black holes B) white dwarfs C) White dwarfs and neutron stars are about equally common. D) Neutron stars and black holes are about equally common. E) neutron stars