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Physics

The _____ muscle pulls the corners of the mouth upward

Which of the following is an example of a reversible process? A hand pump is rapidly compressed and the pressure and temperature in the pump rise. The pump is held in position as the temperature drops to the ambient temperature. A car engine burns fuel to produce motion of the car and exhausts the 140°C waste products of the combustion into the 20°C atmosphere. An ice cube at 0°C melts while in a water bath at 0°C. A stick of dynamite explodes. A high pressure air tank at room temperature has its valve opened and the gas in the tank rushes out until the pressure in the tank is equal to atmospheric pressure.

What causes the angle of the sun to change over the year?

Definition: A command economy is where a central government makes all economic decisions. The government or a collective owns the land and the means of production. It doesn't rely on the laws of supply and demand that operate in a market economy. A command economy also ignores the customs that guide a traditional economy. In recent years, many of these centrally-planned economies have added aspects of the market economy.

A student holds two lead weights, each of mass 6.4 kg. When the students’ arms are extended horizontally, the lead weights are 0.84 m from the axis of rotation and the student rotates with an angular speed of 2.4 rad/sec. The moment of inertia of student plus stool is 9.4 kg m2 and is assumed to be constant; i.e., the student’s arms are massless! Then the student pulls the lead weights horizontally to a radius 0.23 m from the axis of rotation. 1). Find the new angular speed of the student? 2). Find the kinetic energy of the rotating system (comprised of student, stool, and weights) before and after he pulls the weights inward?

A block with a mass of 2.00 kg is placed against a spring on a frictionless incline at an angle of 30 degrees. The block is not attached to the spring. The spring, which has a spring constant k of 19.6 N/cm, is compressed by 20 cm and then released. (a) What is the elastic potential energy of the compressed spring? (b) What is the change in gravitational potential energy of the block-Earth system as the block moves from the release point to its highest point on the incline? (c) How far along the incline is the highest point from the release point?

Where does a phase change occurA: in a explosion B: in mixed paint C: in boiling water D: in a suspension​

What is the mass of an object that has a density of 1.3 g/cm^3 and a volume of 2cm^3

A brick of mass 4 kg hangs from the end of a spring. When the brick is at rest, the spring is stretched by 3 cm. The spring is then stretched an additional 2 cm and released. Assume there is no air resistance. Note that the acceleration due to gravity, g, is g=980 cm/s^2. Set up a differential equation with initial conditions describing the motion and solve it for the displacement s(t) of the mass from its equilibrium position (with the spring stretched 3 cm).

A rubber ball with mass 0.20 kg is dropped vertically from a height of 1.5 m above the floor. The ball bounces off of the floor, and during the bounce 0.60 J of energy is dissipated. What is the maximum height of the ball after the bounce?

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