Other Physics Answers

An astronaut on the Moon dropped a tool from his space vehicle which is 5m from the ground. How long would it take for the tool to reach the ground?

Leonard wanted to measure the depth of the dried-up well beside their house. He dropped a coin in to it, and it took 2 seconds for the coin to reach the ground. What is the total depth of the well? (Disregard the external factors that might affect the coin’s velocity.)

A wire made of copper is found to have a change in resistance of 17% after its temperature change. If the resistance of this wire was 8.66 Ω at 20 ⁰C, and the resistivity after the change in temperature is found to have decreased, determine the following: 

If the wire is connected to 14 V battery, how many electrons pass through a cross-sectional area A in 3 min after temperature change, assuming the wire is an ohmic conductor          

Select one:

 2.2×10²¹ electrons

1.6×10¹⁹ electrons 

3.6×10¹⁹ electrons

1.2×10²¹ electrons

a train moving away from a sound detector at 30.0 m/s blows a 300-hz whistle.speed of sound is 340 m/s.what frequency is detected on each of the following?

a.stationary train.

b.a train moving away from the first train at speed of 20.0 m/

A wheel rotatung at 1p.5rads-1 takes 5.2 to stop calculate

Angular acceleration

The number if revolution the wheel makes before it stops

If a 20-kg object experiences a 30-N force for a duration of 0.20-second, then what is the momentum

change of the object?

Two forces, F₁ = 8.0 N, 60^o Northwest and F₂ = 12.0 N, Southwest, are applied to a particle at the origin. What third force is needed so that the particle will not be displaced from the origin?

What is the velocity and direction of the collision if a rail way train with mass of 6000kg is moving to

the right at 2.0m/s and collides with an empty freight train mass 3,000kg which is moving to the left on

the same track at 3.0m/s?

Answer the following conceptual questions and practice about potential and kinetic energy.

1. You have two balls, a tennis ball and a baseball with twice the mass of the tennis ball. If you want to throw both balls with the same kinetic energy, how much faster should the tennis ball be compared to the baseball?

Where do you use dynamo in your daily life?