Friday

February 27, 2015

February 27, 2015

Posted by **Jacqueline** on Friday, December 2, 2011 at 12:24am.

a) At what velocity should he throw the bag?

b) How far from the house is he standing when he throws the bag?

- Physics Honors -
**Steve**, Friday, December 2, 2011 at 11:33amthe equation of motion for an object thrown from (0,0) at an angle θ with velocity v is

y(x) = -g/(2v^{2}cos^{2}θ) x^{2}+ xtanθ

the range (where y=0 again) is

r = v^{2}sin2θ/g

the maximum height reached is

h = v^{2}sin^{2}θ/2g

So, we know that

h = 10

θ = 60°

10 = v^{2}(3/4)/(2*9.8)

10 = .038 v^{2}

v^{2}= 263.16

v = 16.22

The range is twice the distance to the balcony, so the balcony is at half the range:

r = 16.22^{2}sin(120)/9.8

= 263.09 * √3/2 / 9.8

= 23.24

so, he stood 11.62m from the house

**Answer this Question**

**Related Questions**

Physics - A boy wants to throw a ball into his friend’s window 16.0 m above. ...

physics - You are riding in the back of an open pick-up truck in the snow as you...

physics - standing on the ground, you throw a 0.55 kg lunch bag at a friend, you...

Math - A firefighter is on the fifth floor of an office building. She needs to ...

Physics - Henrietta is going off to her physics class, jogging down the sidewalk...

physics - Henrietta is going off to her physics class, jogging down the sidewalk...

Physics (PROJECTILE MOTION) - Henrietta is going off to her physics class, ...

physics - Henrietta is going off to her physics class, jogging down the sidewalk...

math - Billy has a bag of candy that contains 13 red pieces, 9 green pieces, 3 ...

English - Can you check these very last sentence of the day, please? 1) One day...