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The air outside the balloon has a temperature of 20.0°C and a pressure of 1.00 atm. How large a payload (including the envelope of the balloon itself) can the balloon lift? Use 29.0 g/mol for th
Also if plastic rod is rubbed with fur and acquires a charge of magnitude 7.50 nC. What is the change in mass of the rod?
A double-convex lens is to be made of glass with an index of refraction of 1.5. One surface is to have twice the radius of curvature of the other and the focal length is to be 40 mm. What is the lar
The automobile then undergoes a uniform acceleration of -4 m/s2 because of a red light and comes to rest. It remains at rest for 46.7 s, then accelerates back to a speed of 20.7 m/s at a rate of 2.36
A) A tennis ball is dropped from 1.51 m above the ground. It rebounds to a height of 0.822 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s2 . (Let down be negative
Starting at the origin, going clockwise, the particles have masses 2.3 kg, 1.4 kg, 3.7 kg, and 2.9 kg. What is the location of the center of mass of the system of particles?
A hospital patient has been given 131I (half life= 8.04 days) which decays at 4.5 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptabl
The electric force on the dust particle is equal to the weight of the particle. What is the charge on the dust particle? If this charge is provided by an excess of electrons, how many electrons does
A speeder passes a parked police car at a constant speed of 37.8 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.43 m/s2.
A steel piano string is 49.6 inches long. The diameter of the string 0.0421 inches. When struck, this string produces the musical note, B, which has the pitch of 123 Hz. (a) Find the tension of this
The coefficient of kinetic friction between the runway and a tire is 0.60. A wheel has a moment of inertia of 2.9 kg m^2 and a radius of 0.15m. How long is the skid mark that the tire leaves on the
a) Is the sphere positively or negatively charged? Explained. b) Calculate the magnitude of charge on the sphere. c) How much excess or deficit of electrons does the sphere have?
A 26.0 kg hammer strikes a steel spike 2.40 cm in diameter while moving with speed of 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110 s. What is the average strain in the spike during
Calculate the hydrostatic difference in blood pressure between the brain and the foot in a person of height 1.85 m. The density of blood is 1.06×103 kg/m3
a) How wide must this oven be so that it will contain six nodal planes of the microwave disturbance (including the nodal plane at each walls) along its width in the standing wave pattern? b) What i
Pat builds a track for his model car out of wood. The track is 7.00 cm wide, 4.00 m long, and 1.78 m high, and is solid. The runway is cut such that it forms a parabola by the equation y = (x - 4)2
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1250 Hz. The bird-watcher, however, hears a frequency of 1290 Hz. What is the speed of the bird, expressed as a pe
The tires of a car make 45 revolutions as the car reduces its speed uniformly from 100 km/h to 30 km/h. The tires have a diameter of 0.80 m. (a) What was the angular acceleration in rad/s^2?
What is the magnitude of the potential difference between two points that are 1.08 cm and 2.7 cm from a proton?
The charge per unit length along the semicircle is described by the expression lambda = lambda0cosθ. The total charge on the semicircle is 13.7 µC. Calculate the total force on a charge
Two powerless rockets are on a collision course. Rocket 1 is movingat 0.800c relative to Liz, an Earth observer. Rocket 2 is moving at-0.600 c relative to Liz. The two rockets are initially 2.52 x1
A steel rod 2.00 m long is to be used to pry up one end of a 400-kg crate. If a workman can exert a downward force of 400 N on one end of the rod, where should he place a block of wood to act as th
Draw a diagram of the same problem above. if the bullet passes through the wood and continues at 100 m/s east, what is the velocity of the block of wood?
The radius of a solid sphere is measured to be (6.50+-0.20) cm, and its mass is measured to be (1.85+-0.02) kg. Determine the density of the sphere in kilograms per cubic meter and the uncertainty