What is the approximate radius R of 208 82Pb? Express your answer in meters to two significant figures. R = 7.10x10-15 mAssuming that each nucleus is roughly spherical and that its mass is roughly equal to A (in atomic mass units u), what is the density of a nucleus with nucleon number A?Express your answer in terms of A, R0, .

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Abus travels 280km south along a straight path with an average velocity of 88km/h to the south. the bus stops for 24 min, then it travels 210 km south with an average velocity of 75 km/h to the south. how long does the total trip last?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force