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A projectile is launched from level ground. When it lands, its direction of motion has rotated clockwise through 60 degrees. What was the launch angle?
Consider a weathered rock or soil particle lying on a slope. How will the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope?
The Death of Stars Without the fuel to make things expand, gravity starts to crush the atoms closer and closer together How Long do Stars Live?
An object of mass is attached to a spring with spring constant whose unstretched length is, and whose far end is fixed to a shaft that is rotating with angular speed. Neglect gravity and assume that
Gasoline's volume expansion coefficient is 0.00096?C-1. How many extra kilograms of gasoline are obtained when fifteen gallons of gasoline are bought at 0?C rather than at 18?C (tempera- ture at the
The hydrogen and helium are the gas inside the balloon Why doesn't the Balloon deflate or pop? Why doesn't the Balloon deflate or pop?
A patients blood pressure is measured as 140 / 80, measured in level with the heart. What would you expect the blood pressure to be at the top of the head if there is a 45cm height difference in th
The distance covered by a particle in time t while starting with the initial velocity u and moving with a uniform acceleration a is given by s = ut + (1/2)at^2. check the correctness of the expressi
By comparing the age-specific incidence for a given age group to the age-specific incidence of a similar group clearly decrease at older age at the same sites?
A certain freely falling object requires 1.10 s to travel the last 32.0 m before it hits the ground. From what height above the ground did it fall?
The flywheel of a steam engine runs with a constant angular speed of 129 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 2.1 hours. What is the
The train on the right accelerates leftward at 0.82 m/s2.How far does the train on the left travel before the front ends of the trains pass?.
Make a second drawing for the second frequency for which you collected data. Assume the phase angle for the capacitor is 90o. Answer these questions for each drawing: Does Vsource = IZ?
A driver traveling at 44.0 km/h in a school zone can brake to an emergency stop in 2.80 m. What would be the braking distance if the car were traveling at 52.0 km/h?
Two point charges, separated by 1.9 cm, have charge values of +2.5 and -4.3 μC, respectively. What is the value of the mutual force between them? (ke = 8.99 x 109 N m2/C2)
A hunter wishes to cross a river that is 2.1 km wide and that flows with a speed of 4.4 km/h. The hunter uses a small powerboat that moves at a maximum speed of 12.6 km/h with respect to the water.
An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 V before it hits the target. What is the kinetic energy of the electron in electron volts?
If the two separate resonances cannot be picked out then it may be necessary to reduce the amplitude of the modulating field. Why is this necessary?
A 1800-kg car is going around a smooth banked curve with a radius of 45.0 m from the centre of the curve at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path
Explain the extent to which the equipartition theorem applies to electromagnetic radiation in a box. Which part of your curve from (1) does it predict correctly?
When the centrifuge reaches an angular speed of 2.5 rad/s, the trainee experiences a total acceleration equal to 4.2 times the acceleration due to gravity. The arm of the centrifuge has a length of
A force of 6.00 N acts on a 3.00-kg object for 10.0 s. What is the object's change in momentum? What is its change in velocity?
How many extra kilograms of gasoline are obtained when fifteen gallons of gasoline are bought at 0C rather than at 18C (tempera- ture at the filling station)? Answer in units of kg.
You are most sensitive to waves of this frequency, because your ear canal actually resonates with the sound, what"s the NEXT harmonic that"s allowed?
find (a) the magnitude of the tension in the wire and the magnitudes of the (b) horizontal and (c) vertical components of the force that the wall exerts on the left end of the beam.