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How many electrons must be removed from A and put onto B to make the electrostatic force that acts on each object an attractive force whose magnitude is 72.0 N?
Using energy conservations, how would your calculated final velocity change if you threw a ball off a building straight downward at the same speed as you threw it upward? Explain/give an example.
The distance between 2 telephone poles is 50.0 m. When a 1.00 kg bird lands on the telephone wire, midway between the poles, the wire sags 0.200 m. (a) Draw a free-body diagram of the bird. (b) How
A mass is fixed to a spring and slides along a surface without friction. The mass is 0,50 kg and the spring constant is k = 40 N/m. We pull the mass to the right, 8,0 cm from the point of equilibriu
A block of mass 2kg and another 6kg are connected by massless string over a pulley in a shape of a disk with radius 0.38m and a mass of 4kg. I addition, the blocks are allowed to move on a fixed blo
The spring-loaded launcher makes an angles of 45 degree with the lower edge of the inclined plane.The goal is to get the ball in a small hole at the opposite corner of the inclined plane. With what
If a 114 A · h battery can deliver a steady current of 4.5 A until it is completely depleted, what is the total time the battery can deliver current without being recharged?
A plane has an airspeed of 142 m/s. A 16.0 m/s wind is blowing southward at the same time as the plane is flying. If the velocity of the plane relative to Earth is due east, what is the magnitude of
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 14 g nail when it is struck by a 550 g hammer moving with an initia
A small car collides with a large truck. Is the magnitude of the force experienced by the car greater than, less than, or equal to the magnitude of the force experienced by the truck?
Two nanowires are separated by 1.2 nm as measured by STM. Inside the wires the potential energy is zero, but between the wires the potential energy is greater than the electron's energy by only 1.4
A radar trap operates at a frequency of f=10GHz. The speed of microwaves is v=3.0*10^8 m/s. The microwave beam is aimed at a car approaching at 72km/hr (20m/s). a) Calculate the difference between t
Suppose the clay ball is dropped from the ceiling onto an empty pan. What is the pan's distance from the ceiling when the spring reaches its maximum length?
The radius of the earth is 6380 km and turns once on its axis in 24 hours. What is the radial acceleration if the equator were sitting in a city with latitude 34 degrees? Does this rotation make us
A 2.0 µF capacitor and a 4.0 µF capacitor are connected in series across 1000V. the charged capacitor are then disconnected from the source of connected to each other with terminals of l
An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.95 m/s. The rock falls through a vertical distance of 1.40 m and lands a horizontal distance of 8.75 m from the astrona
Assume the magnitude of the acceleration is the same during starting and stopping. (a) Determine the weight of the person.
The equation of motion of a particle in vertical SHM is given by y = (20 cm) sin[(0.25 rad/s) t]. What are the particle's (a) displacement, (b) velocity, and (c) acceleration at t = 2.0 s? Also, wha
A 36 kg block slides with an initial speed of 8 m/s up a ramp inclined at an angle of 15o with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.8. Use energy c
A 1200-turn coil of wire that is 2.3 cm in diameter is in a magnetic field that drops from 0.12 T to 0 in 9.0 ms. The axis of the coil is parallel to the field.
A plane ,driving at an angle of φ with the vertical, releases a projectile at an altitude of 730m. The projectile hits the ground 5.0s after it was released, having travelld a horizontal distan
The spheres come to rest in equilibrium, with their centres 15cm apart. What is the magnitude of the charge on each sphere?
What amount of solid sodium acetate is needed to prepare a buffer at pH 5.2 from 500 mL of 0.10 M acetic acid? The pKa of acetic acid is 4.75.
Calculate the maximum nonexpansion work that can be gained from the combustion of benzene (l) and of H2 (g) on a per gram and a per mole basis under standard conditions.
In a student experiment, the empirical formula of a copper halide was found by adding aluminum metal to an aqueous solution of the halide, displacing copper metal.