A car is driven 160 km west and then 90 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
Electromagnetic waves transport energy. This problem shows you which parts of the energy are stored in the electric and magnetic fields, respectively, and also makes a useful connection between the energy density of a plane electromagnetic wave and the Poynting vector. In this problem, we...
A 66-N m torque acts on a wheel with a moment of inertia 175 kg m2. If the wheel starts from rest, how long will it take the wheel to make one revolution?
A block is pushed against the spring with spring constant 11 kN/m (located on the left- hand side of the track) and compresses the spring a distance 5.5 cm from its equilibrium position (as shown in the figure below). The block starts at rest, is accelerated by the compressed spring, and...
The force acting on a particle varies as in Figure P5.55. (The x axis is marked in increments of 0.500 m.) Figure P5.55 Find the work done by the force as the particle moves across the following distances. (a) from x = 0 m to x = 4.00 m J=? (b) from x = 4.00 m to x = 6.00 m J=? (c)...
A rifle is aimed horizontally at a target 49.0 m away. The bullet hits the target 2.60 cm below the aim point. What was the bullet's flight time?
At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?
A 2.0-kg block slides down a frictionless ramp, as shown in the figure. The top of the ramp is 1.5 m above the ground; the bottom of the ramp is h = 0.23 m above the ground. The block leaves the ramp moving horizontally, and lands a horizontal distance d away. Find the distance d.
A 210-N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy associated with the child relative to her lowest position at the following times.
A 44.0-kg projectile is fired at an angle of 30.0 above the horizontal with an initial speed of 105 m/s from the top of a cliff 164 m above level ground, where the ground is taken to be y = 0. Suppose the projectile is traveling 85.0 m/s at its maximum height of y = 272 m. How much work has...
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1. Can you show me step by step how to solve this problem?:
- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas