9. Work & Energy

Intro to Energy & Kinetic Energy

9. Work & Energy

# Intro to Energy & Kinetic Energy - Video Tutorials & Practice Problems

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## Intro to Energy & Types of Energy

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Problem

ProblemAbout 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Some estimates suggest this meteor had a mass of about 1.4×10^{8} kg and released 1×10^{16} J of energy when it slammed into the Earth. Calculate the approximate speed of this meteor before impact.

A

8,450 m/s

B

12,000 m/s

C

1.43×10

^{8}m/s## Do you want more practice?

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PRACTICE PROBLEMS AND ACTIVITIES (17)

- (II) For a satellite of mass in a circular orbit of radius r_S around the Earth, determine(a) its kinetic ener...
- (c) Is it reasonable that a 30-kg child could run fast enough to have 100 J of kinetic energy?
- (I) At room temperature, an oxygen molecule, with mass of 5.31 x 10⁻²⁶ kg, typically has a kinetic energy of a...
- A mother has four times the mass of her young son. Both are running with the same kinetic energy. What is the ...
- At what speed does a 1000 kg compact car have the same kinetic energy as a 20,000 kg truck going 25 km/h?
- A 45 g bug is hovering in the air. A gust of wind exerts a force F (→ above F) = (4.0î-6.0ĵ) x 10¯² N on the b...
- How much work does tension do to pull the mass from the bottom of the hill (θ = 0) to the top at constant spee...
- A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the engine and the drive t...
- A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the engine and the drive t...
- A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the engine and the drive t...
- A 150 g particle at x = 0 is moving at 2.00 m/s in the + x - direction. As it moves, it experiences a force gi...
- T ─ (1500 kg) (9.8 m/s²) = (1500 kg) (1.0 m/s²) P = T (2.0 m/s) (a) Write a realistic problem for which this i...
- A particle moving on the x-axis experiences a force given by Fx = qx², where q is a constant. How much work is...
- T ─ (1500 kg) (9.8 m/s²) = (1500 kg) (1.0 m/s²) P = T (2.0 m/s) (c) Finish the solution of the problem.
- The gravitational attraction between two objects with masses mᴀ and mᴃ, separated by distance 𝓍, is F = Gmᴀmᴃ...
- CALC An object moving in the xy-plane is subjected to the force F(arrow on top) =(2xy î+x² ĵ) N, where x and y...
- CALC An object moving in the xy-plane is subjected to the force F(arrow on top) =(2xy î+x² ĵ) N, where x and y...