One possible means of achieving space flight is to place a perfectly reflecting aluminized sheet into Earth

1a. On planet #4, you fire a projectile from the ground at an initial speed of 29.7 m/s at an angle of 44.7 degrees above the horizontal. The projectile lands 36.1 m away from the launch point. What is the value of g for planet #4?

b. On planet #5, a stone dropped from a height of 44.4 m above the ground will hit the ground at a speed of 43.2 m/s. What is the value of g for planet #5?

c. You launch a projectile with an initial speed of 56.0 m/s from the top of a building 76.3 m above the ground, at an angle of 25.8 degrees above the horizontal. How far from the base of the building does the projectile land on the ground?

A simple pendulum with mass m = 1.5 kg and length L = 2.49 m hangs from the ceiling. It is pulled back to an small angle of θ = 9.5° from the vertical and released at t = 0.

What is the magnitude of the force on the pendulum bob perpendicular to the string at t=0?

What is the maximum speed of the pendulum?

What is the angular displacement at t = 3.67 s? (give the answer as a negative angle if the angle is to the left of the vertical)

What is the magnitude of the tangential acceleration as the pendulum passes through the equilibrium position?

What is the magnitude of the radial acceleration as the pendulum passes through the equilibrium position?

Which of the following would change the frequency of oscillation of this simple pendulum?

increasing the mass

decreasing the initial angular displacement

increasing the length

hanging the pendulum in an elevator accelerating downward

Sketch a blackbody radiation spectrum for a hot object and a cold object. What two things differ between the two spectra? Explain, using an illustration, what the spectrum looks like for an object that is not a blackbody.

Three 81.6 g masses are connected in a triangular shape by massless rigid wires as shown in the first image (which is not drawn to scale). The coordinates of each mass are given in centimeters. Mass A is located at (0,0) , mass B is at (12.2,22.5) , and mass C is at (21.3,13.4) . Find the ? - and ? ‑coordinates of the center of mass of the triangular object. A graph has a vertical Y axis and a horizontal X axis. Three masses are shown. Mass A is located at (0,0), mass B is at (12.2,22.5), and mass C is at (21.3,13.4). ?cm= cm ?cm= cm Two more 81.6 g masses are connected by a straight piece of wire and affixed to the original configuration as shown. The coordinates of mass D are (0,−27.0) and the coordinates of mass E are (0,27.0) . Find the ? - and ? ‑coordinates of the new center of mass of the combined object. A graph has a vertical Y axis and a horizontal X axis. Five masses are shown. Mass A is located at (0,0), mass B is at (12.2,22.5), mass C is at (21.3,13.4), mass D is at (0, -27.0), and mass E is at (0, 27.0). ?cm= cm ?cm= cm

What are the core concepts and methods of Kinematics?

What are the core concepts and methods of Dynamics?

What are the core concepts and methods of Work-Energy relationships?

How all of the above are related?

How consideration of others perspectives changed or improved your thinking on all of the above?

1. A 1400 kg car goes around a corner with a radius of curvature= 60m.

a) if the coefficient of static friction between the tires and the roads is 0.800 what is the maximum speed the driver can go before skidding. the curve is unbanked/flat.

2. A 2.40kg uniform rod of length of .750m rotates about its center. At t=0, its angular speed =2.50 rad/sec. It smoothly increases its rotation rate with an acceleration a=1.50 rad/s^2

a) what is its angular speed at t=6.50 seconds

b) how many radians would a spot on the rod have gone during those 6.50 seconds

c) what is the linear speed at t=6.50 seconds at the spot at the end of the rod

d) find the force that would need to be applied tangentially to the end of the rod have this acceleration

A 5.80 x 103 kg delivery truck moving with a velocity of 20 m/s hits a 1.50 x103 kg parked car. As a result of the impact, the car was set in motion at 31.8 m/s. (Assume the car –truck to be an isolated system) (a) Sketch the situation. (b) Find the velocity of the truck immediately after the collision; (c) Find the kinetic energy of the car-truck system before and after the collision. (d) Is the car-truck collision elastic or inelastic? Explain (e) What is the change in momentum of the car? Assuming the collision time to be 2 seconds, how much average impact force did the car experience? (f)What is the change in the momentum of the truck? Solve for the impact force experienced by the truck.

Two pucks are sliding across a frictionless surface. Puck A has a mass of .330 kg and a velocity of 5.50 m/s in the x direction. puck be has a mss of .440 kg and a velocity of 6.60 m/s in the negative x direction.

the pucks collide an bounce of each other. after the collision puck a has a velocity of 1.10 m/s in the positive y-direction. What are the x and y components of the velocity of puck ba fter the collision.

Two ice skaters, with masses of 50.0 kg and 65.0 kg , are at the center of a 30.0 m -diameter circular rink. The skaters push off against each other and glide to opposite edges of the rink.

If the heavier skater reaches the edge in 10.0 s , how long does the lighter skater take to reach the edge?

Find the heat capacity of a block of unknown material. You will immerse the block, with its temperature known, into a known quantity of water, which is at a very different temperature than the block. After they reach equilibrium, they will be at the same final temperature. From the change of temperature of both, calculate the block's heat capacity.

NOTE: You can heat up or cool the block using hot water or ice water

HOW WILL I DO THIS ? ?? ? ? explain please physics wizards of chegg

• How is Bernoulli’s Principle equivalent to the Work Energy Theorem and the Conservation of Energy Principle?

A sound source A and a reflecting surface B move directly toward each other. Relative to the air, the speed of source A is 29.7 m/s, the speed of surface B is 63.5 m/s, and the speed of sound is 330 m/s. The source emits waves at frequency 1350 Hz as measured in the source frame. In the reflector frame, what are (a) the frequency and (b) the wavelength of the arriving sound waves? In the source frame, what are (c) the frequency and (d) the wavelength of the sound waves reflected back to the source?

Near Earth Objects (NEOs) is anything in space that comes too close to Earth (within 1.3 AU) and is sufficiently large. Describe two challenges astronomers face in finding NEOs.

Additionally, scientist distinguish between potentially hazardous objects (140m or larger) and hazardous objects (larger than 1km). What would happen to Earth if an object greater than 1km collided with the planet?

What would happen to Earth if a potentially hazardous object collided with the planet?

What is kinetic energy and how does it relate to the Boltzmann distribution?