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What is the difference between 'ser' and 'estar'?

Both ser and estar mean 'to be', but they are used in different contexts.Ser is generally used for permanent states, including nationalities, genders and professions. It can als...

Answered by Florine L. • Spanish tutor

1682 Views

Describe your best friend

Il mio migliore amico si chiama Pietro. E' un ragazzo moro e alto. Ha gli occhi verdi e piccoli. Gli piace molto il calcio, tifa la Roma e non si perde mai una partita della sua squadra del cuore. Gli pia...

Answered by Matteo C. • Italian tutor

3974 Views

Express 4sin(x)+6cos(x) in terms of Rsin(x+a) where R and a are constants to be determined (a should be given in rad).

R=sqrt(42)=6.48...a=arcos(4/sqrt(42))=0.905...Rsin(x+a)=6.48sin(x+0.905)

Answered by Benjamin U. • Maths tutor

4238 Views

Integrate ln(x)

Take ln(x) = 1 * ln(x) and integrate by parts. Let u = ln(x) and dv/dx = 1 such that du/dx = 1/x and v = x. Using the integrating by parts formula, you get x ln(x) - integral(1) = x ln(x) - x + c.

Answered by Jason Y. • Maths tutor

3866 Views

A ball of mass m moves towards a ball of mass km with speed u. The coefficient of restitution is 0. What is the final velocity if the first ball after the collision.

Coefficient of restitution is defined as the ratio of the relative speed of separation of the balls to the relative speed of approach. A ratio of 0 means that the speed of separation has a value of zero a...

Answered by Susannah E. • Maths tutor

3212 Views