76. A simple pendulum is swinging back and forth through a small angle, its motion repeating every 1.25 s. How much longer should the pendulum be made in order to increase its period by 0.20 s?

Physics Ch. 9 #15

r -e Physical constants (A) What is the radius of the orbit with n = 4? (B) What is the speed of the orbit with n = 4? The old Bohr model of the hydrogen atom was based on... (1) the assumption that the electron travels on a circle h = 6.626 x 10-34 Js; -28 (A) (in m) Bohr Model mv² r mvr = n and obeys Newton's second law, and (2) the hypothsis that angular momentum is quantized. For the Bohr model, Ke² = 2.307 x 107 Jm; 31 m9.11 x 10 kg. (B) (in m/s) Ke² 12. (1) (2) OA: 2.034x10-10 OB: 2.706x10-10OC: 3.598x10-10 OD: 4.786x10-10 OE: 6.365x10-10 OF: 8.466x10-10 OG: 1.126x109 OH: 1.497x109 OA: 8.533x104 OB: 1.237x105 OC: 1.794x105 OD: 2.601x105 OE: 3.772x105 OF: 5.470x105 OG: 7.931x105 OH: 1.150x106

A 8 kg ball is moving forward at 7 m/s and it runs into a second ball with mass 5 kg also moving forward at 5 m/s. After the collision the 8 kg ball is moving at 2 m/s, what is the velocity of the 5 kg ball?

25. Suppose a cart with mass m and low-friction wheels is moving to the right at an initial speed of v just before it hits a cart with mass 2m. After the collision, the first cart rebounds to the left with a speed of Assume each cart receives zero net momentum from any external interactions (such as gravitational and contact interactions) other than their collision interaction. (a) What impulses did the collision interaction deliver to each cart? Express the impulses' directions as "left" or "right" and their magnitudes as multiples of m right ward or e tward lett war The impulse delivered to the light cart is mvo(Click to select) vol (Click to select) . htunrd or The impulse delivered to the massive cart is m|vo (b) From this, Infer the massive cart's final velocity v (express its magnitude in terms of o and its direction as being "left" or "right"). nighturrd or leftward The massive cart's velocity is oll(Click to select) Hints Hint H1

Two electrons in an atom are separated by 1.6 × 10^−10 m, the typical size of an atom. What is the force between them? The Coulomb constant is 9 × 10^9 N · m^2/C^2 . Answer in units of N.

The figure shows the distribution of nuclear charges (positive charges) in a KBr molecule. Find the magnitude of the electric field (at 10¹0 N/C) at the center of mass of the molecule, knowing that dBr=9.3.10-11 dk-1.89.10-1⁰ m. e=1,602.10-¹⁹℃) a) 506,76 Br +35e b) 516,76 dBr (k=9.10⁹ c.m. dk Fig.123 c) 526,76 K +19e d) 536,76 m, N•m²/C² e) 546,76 "

One hazard of space travel is debris left by previous missions. There are several thousand objects orbiting Earth that are large enough to be detected by radar, but there are far greater numbers of very small objects, such as flakes of paint. Calculate the force exerted in newtons by a 0.200 mg chip of paint that strikes a spacecraft window at a relative speed of 4.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10−8 s. (Enter the magnitude.)

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One form of nuclear radiation, beta decay, occurs when a neutron changes into a proton, an electron and a neutral particle called a neutrino. When this change happens to a neutron within the nucleus of an atom, the proton remains behind in the nucleus while the electron and neutrino are ejected from the nucleus. The ejected electron is called a beta particle. One nucleus that exhibits beta decay is the isotope of hydrogen 3H, called tritium, whose nucleus consists of one proton (making it hydrogen) and two neutrons (giving tritium an atomic mass m = 3u). Tritium is radioactive, and it decays to helium. Suppose an electron is ejected from a 3H atom, which has a radius of 1.000×10-14 m. The resulting 3He atom has the same radius as the 3H atom. What is the escape velocity of the electron ejected from the process? Note: Your answer may be larger than the speed of light which is okay in this scenario. To solve this problem correctly we would need to use special relativity.