Một đòn bẩy dài 1,5m. G là trọng tâm. Đầu A đặt vật 10kg, điểm tựa O cách A 50cm. Đòn bẩy hợp với mặt đất 1 góc 30°. Tìm lực tác dụng vào đầu B để đòn bẩy cân bằng trong các trường hợp sau : a, lực F có phương ngang
b, lực F thẳng đứng
c, lực F vuông góc với AB

An electric current is flowing through the cord below.what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.

Mark creates a graphic organizer to review his notes aboutelectrical force.which labels belong in the regions marked x and y?

Consider motion in one dimension. (the sign of the vector quantities is their direction indicator.) an object moves in the positive x-direction with speed 2.9 m/s for 4.5 s. it stops for 3.8 s and then moves in the negative x direction with speed 2.8 m/s for 4 s. what is the total distance traveled by the object in units of meter? enter a number with two digits behind the decimal point.