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Physics
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What velocity should your boat have if you want to cross a 72m wide river in 6s by the shortest distance, with a 5 m/s downstream current?

Key physics concepts: Velocity vectors, Distance/speed/time relations Key mathematical concepts: Trigonometry, Pythagorean triples, Vector addition/subtraction.Recall that velocity is a vector

Answered by • Physics tutor
1814 Views

Does a negative acceleration always mean that the object is slowing down?

Sometimes, but definitely not always! Note: it's all dependent on which direction has been assigned '+'. Acceleration is a vector quantity, (the rate of change of velocity), meaning it has both<...

RG
Answered by Rohan G. • Physics tutor
15298 Views

A conical pendulum is a mass suspended from a point that traces out a horizontal circle. By balancing the weight with the tension in the string, determine the speed of the bob.

Draw a free-body diagram for the mass with the pendulum suspended at an angle θ to the vertical. The tension in the rope is T and the radius of the circle is r.
Firstly, resolve horizontal forces an...

DS
Answered by Daniel S. • Physics tutor
2563 Views

A car travels 100 metres in 20 seconds. i) What is the cars speed? ii) How far would the car travel in 1 minute 40 seconds?

To answer this question, we will need the following equation: SPEED = DISTANCE/TIME (A multiplication and division triangle will be shown)i) The speed of the car is calculated by doing 100 metres/ 20 seco...

DH
Answered by Delwar H. • Physics tutor
17594 Views

What is the difference between renewable and non renewable energy resources and give examples for each category

Renewable Energy resource is cannot be used up as they can be replaced whereas non-renewable energy resources cannot be replaced once they're used up. Examples of Non-renewables are coal, oil, gas and nuc...

ZX
Answered by Zieger X. • Physics tutor
2150 Views

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