The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 36Nm . You plan to tighten the plugs by pulling on the end of a 24-cm-long wrench. Because of the cramped space under the hood, you'll need to pull at an angle of 130 with respect to the wrench shaft. With what force must you pull? I can't seem to get this one.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)