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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
A person who weighs 641 N is riding a 94.0 N mountain bike. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 7.50E+5 Pa, w
An airtight box has a removable lid of area 1.34E-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 8.34E+4 Pa. The inside of the box is completely
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 2.89E+28 kg and 1.08E+3 m. Calculate the density of such a star.
The angular velocity, omega, of the system is 1.1 rad/s when the student is at the rim. Find omega when the student is 2.73m from the center.
Light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73. What is the frequency of this light in the medium?
The human body normally produces about 2 X 10^6 red blood cells per second. A. Use scientific notation to express how many red blood cells your body produces in one day.
If you want to design a centrifuge of diameter 1.6 m to have a force of 129,000 times the force of the Earth's gravity, what is the speed of the outer edge of the centrifuge? Such a device is called
At a time of 1.60 s after she enters the water, her speed is reduced to 1.50 m/s. What is the net average force (magnitude and direction) that acts on her when she is in the water?
A single square loop of wire 23.7 cm on a side is placed with its face parallel to the magnetic field between the pole pieces of a large magnet (which is another way of saying the vector normal to t
There is a uniform magnetic field present, given by B=0.003 i + 0.004 j + 0.002 k, where i,j,k are the unit vectors along the cartesian coordinate axes in units of Tesla. Calculate the y-component o
A 1.10m long straight wire has a resistance R = 14.0Ohm and is connected to a 3.00V battery. The wire is located in a uniform magnetic field B directed perpendicular to the wire. Calculate the magni