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Physics
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State Newton's 2nd Law, and use this explain the vertical motion of a parachutist in the descent from her plane to Earth.

Newton's second law: Fnet = m.a. The net force (vector) on an object is directly proportional to the product of its mass (sca...

Answered by Akash B. Physics tutor
2911 Views

What is the difference between a vector and a scalar quantity?

A scalar quantity is one that has a magnitude (size) only, and no associated direction in which that size 'points'. A good example of a scalar is temperature, because temperature has a size (for example 2...

Answered by Frazer N. Physics tutor
4503 Views

A cyclist rides 10km. In the first 5km, they climb a hill, averaging 10km/h. In the second 5km, they descend the hill, averaging 30km/h. What is their average speed over the full 10km?

A common response from the student for the above question is: “I got 20km/h but it says it’s wrong! help i’m really confused”. The following two paragraphs will outline how I might attempt explain this id...

Answered by Shihabul B. Physics tutor
2949 Views

A hot air balloon is travelling at a speed of 5.0m/s at an angle of 60.0 degrees up from the horizontal. Find the vertical and horizontal components.

The diagram would have the following:

An arrow pointing upwards labeled v(y)

An arrow pointing to the right labeled v(x)

An arrow pointing in between those lines with a degree between...

Answered by Marta B. Physics tutor
1746 Views

Define the resistivity of a metal wire

ρ = (AR) / l

where:

ρ is the resistivity of the metal wire

A is the cross sectional area of the specimen wire

R is the electrical resistance of  a uniform metal wire

l i...

Answered by Javier E. Physics tutor
2859 Views

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