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A projectile is fired out of a cannon at 50 km/s, at an angle of 30 degrees and an elevation of 10m from the ground. How long does it take for the projectile to hit the ground?

Find the verticle velocity by resolving the velocity vector:

Trigonometry: 50sin30 = 25m/s in upwards direction

Using SUVAT for the vertical direction: S=-10, U=25, A=-9.81, V=N/A, T=?:

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Answered by Lewis C. • Physics tutor

2270 Views

Differentiate the function f(x) = 2x^3 + (cos(x))^2 + e^x

When differentiating a function that is the sum of three different parts we can differentiate each part separately:

a) 2x³ is easy to differentiate. We remember the rule d/dx[ax^b

Answered by Seth P. • Maths tutor

6173 Views

A stationary particle explodes into 3: A (to the left), B and C (both to the right). B has mass m and speed 3v. C has mass 2m and speed v. A has speed 2v. What is the mass of A in terms of m?

The key to solving this is remembering that momentum is conserved. The large, initial particle has no speed so its momentum is zero. Therefore, if we add together the momenta of the final particles we als...

Answered by Seth P. • Physics tutor

2380 Views

How to create a convincing argument in an exam

Read as much as possible and consult multiple sources. When you explore the different ways in which historians write you can pick up manerisms that develop your own writing skills and thus give your writi...

Answered by Alexander H. • History tutor

2696 Views

How best to maximise marks in exams, for example in definitions or in 20 mark questions

For any question the you should first consult the mark schemes and ensure that you are understanding exactly what they are saying. For a definition question repition is key, making sure that you understan...

Answered by Alexander H. • Economics tutor

3339 Views