4 points A basketball (m = 0.7 kg) approaches the backboard (missing the rim entirely) at a speed of 3.3 m/s. The rebound careens off the backboard at a speed of 0.9 m/s, a
true brick. Determine the magnitude of impulse delivered by the backboard onto the basketball.
O 1.68 kgm/s
0
2.31 kgm/s
ОО
1.22 kgm/s
0.63 kgm/s

Space-time metric ds2= -dt2+at2dx2+bt2dy2+ct2dz2 (a)how does the area of a rectangle with vertices at ( x=0, y=0, z=0 ), (1,0,0 ), ( 0,1,0 ) and (1,1,0 ) changes with time? (b) if a photon moving in the x direction starts from the origin at t=1, when does it reach x=l? (ds=0 for the trajectory of a photon.) (c) the proper time for a particle is defined by cd=ds. what is the proper time for a particle to move along the trajectory ( x(t)=t, y(t)=0, z(t)=0 ) from t=0 to 1 ? what is the condition on the parameter a so that the velocity of the particle never exceeds the speed of light ?

3. which is not a primary color of light? blue red green yellow

An airplane is flying with a velocity of 240 m/s at an angle of 30.0∘ with the horizontal, as the drawing shows. when the altitude of the plane is 2.4km,a flare is released from the plane. the flare hits the target on the ground. what is the angle θ?