Other Physics Answers

 A car has the same kinetic energy when it is traveling south at 30 𝑚/𝑠 as when it is traveling northwest at 30 𝑚/𝑠. Is the momentum of the car the same in both cases? Explain.

1. A mass of 0.5 kg hangs from a spring and stretches it 0.49 m. What is its spring constant?

What is an example of the first law of thermodynamics? 5.0-g bullet traveling at a

speed of 300 m/s enters a tree and exits the other side with a speed of 150 m/s.

Where did the bullet’s lost kinetic energy go, and how much energy was

transferred?

Explain how the following situations are affected by impulse and momentum.

Suppose a plane and a boat are both moving in the same direction along the ocean. The plane is much faster than the boat. Is it correct to assume that the plane will always have a higher momentum compared to the boat? If yes, explain why. If no, explain when the boat can have a higher momentum than the plane. .

Explain how the following situations are affected by impulse and momentum.

1. In a vehicular accident, your momentum changes abruptly and your body experiences a large amount of force. How do airbags save you from experiencing a large enough force to cause serious damage? Explain using the impulse-momentum theorem.

2. In order to catch a ball, a baseball player naturally moves his or her hand

backward in the direction of the ball's motion once the ball contacts the hand. Why do they do this? Explain using the impulse-momentum theorem.

A large punch bowl holds 3.50 kg of lemonade (which is essentially water) at 25.0 ° C. A 5.70x10 2-kg ice cube at -12.0 °C is placed in the lemonade. What is the final temperature of the system? Ignore any heat exchange with the bowl or the surroundings. What is the amount of ice (if any) remaining

A mass of 0.30 kg attached to a vertical spring, stretches the spring by 10 cm. Find

(a) the spring constant k.

(b) Work done by gravity and the spring force.

(c) the maximum restoring force.

(d) What is the change in gravitational potential energy?

Determine the wave number of the wave, where A=9.8m and B=1.3m. NOTE: Use this notation in writing your unit (Examples: 1/m or 1/s).

A pillow is dropped on the earth from the height of 3.40 meters. The acceleration of gravity on the earth is -9.8m/s2. Determine the time for the feather to fall to the surfec of the earth

The driver of a 2.0 × 10³ kg red car traveling on the highway at 45m/s slams on his brakes to avoid striking a second yellow car in front of him, which had come to rest because of blocking ahead as shown in above Fig. After the brakes are applied, a constant friction force of 7.5 × 10³ N acts on the car. Ignore air resistance.

(a) Determine the least distance should the brakes be applied to avoid a collision with the other vehicle?

(b) If the distance between the vehicles is initially only 40.0 m, at what speed would the collision occur?

(c) Write your conclusive observations on the result obtained from this numerical. i.e. the importance of Physics in daily life.