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42 g firecracker at rest at the origin when it explodes into three pieces the first with mass 12 g moves along the x axis at 35m/s the second mass is 21g moves along the y axis at 29m/s find the vel
A hollow conducting spherical shell of radius 1.20 cm carries a charge of -5.20 nC. What is the electric field at a distance of 1.50 cm from the center of the shell?
Two barometers are made with water and oil. the density of the oil is 900 kg/m3 and that of water 1000 kg/m3. If the oil column is 10m tall, how hall is the water column.
A transition in a nucleus consists of changing a three-quarks group uud to a udd collection. This transition is mediated by which of the four basic forces? Hint, what is the net effect of this chang
Assume a perfectly elastic collision and take the initial direction of the balls as positive. a) What is the velocity of the tennis ball after the collision?
A neon atom (m = 20.0 u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a 54.6° angle from its original direction and the unknown
A capacitor of capacitance C = 6 oF is connected in series with a resistor R = 5 M to a battery of emf E=15V What is the value of the current in the circuit when the capacitor has reached 20% of its
If the block compresses the spring 4.8 cm before coming to rest, what is the force constant of the spring?
A 9.0uF capacitor, a 11uF capacitor, and a 19uF capacitor are connected in series. What is their equivalent capacitance?
Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse the catapult receives from the rock?
A 10 kg block is pushed against a vertical wall by a horizontal force of 100N . The coefficient of static friction is .60 and the coefficient of kinetic friction is .4. what is true if the block is
A 3 kg cart moving to right with speed of 1m/s has a head on collision with a 5 kg cart initially moving to left with speed of 2 m/s. after collision the 3 kg cart moves left with speed of 1 m/s, wh
What minimum amount of energy does this acceleration require from the spaceship's fuel, assuming perfect efficiency
If the contact force is removed, what magnitude and direction of acceleration is produced?
A net force described by the equation F(x)=x^2+5x, acts on a mass of 3 kg. what is the object's speed after moving a distance of 4 meters if its initial speed was 10m/s?
A 4.0X10^-6 capacitor is charged to 6.0V. It is then connected in series with a 3.0M Ohm resistor and connected to a 12v battery. How long after being connected to the battery will the voltage acros
When a 100Ohm resistor is connected to a battery of emf E and internal resistance of r, the battery delivers a power of P=.794W. When a 200 ohm resistor is connected to the same battery it delivers
A 4.0x10^-6 Farad capacitor is connected in series with a 2000 ohm resistor across a 20V-DC power supply and an open switch. If the switch is closed at t=0 seconds what is the charge on the capacito
A grandfather clock has a pendulum length of 0.7 m and mass bob of 0.4 kg. A mass of 2 kg falls 0.8 m in seven days to keep the amplitude (from equilibrium) of the pendulum oscillation steady at 0.
A baseball has a mass of 0.12 kg, and a major-league pitcher can deliver a ball with a speed of 30 m/s. Compute the de Broglie wavelength of a pitched baseball.
(a) If the gravitational potential energy U of the rock-Earth system is zero at the bottom of the hill, what is the value of U just before the slide? (b) How much energy is transferred to thermal en
What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the block and floor
The radius of the Earth is RE = 6.37 x 106 m, the mass of the Earth ME = 5.98 x 1024 kg, the acceleration due to gravity on the surface of the Earth g = 9.81 m/s2 and the gravitational constant G = 6.
A series of object are being rotated. The same net torque is being applied to each object. Rank the object in order of the resultant angular acceleration (1 = lowest). a) A solid sphere spinning abo