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Ivanshal [37]
3 years ago
12

An object travels with velocity v = 4.0 meters/second and it makes an angle of 60.0° with the positive direction of the y-axis.

Calculate the possible values of vx.
Physics
1 answer:
zhenek [66]3 years ago
5 0

Answer:

2 m/s and -2 m/s

Explanation:

The object travels with an angle of

60.0°

with the positive direction of the y-axis: this means that it lies either in the 1st quadrant (positive x) or in the 2nd quadrant (negative x).

If it lies in the 1st quadrant, the value of vx (component of v along x direction) is:

v_x = v cos \theta = (4.0 m/s) cos 60.0^{\circ}=2 m/s

If it lies in the 2nd quadrant, the value of vx (component of v along x direction) is:

v_x = -v cos \theta = -(4.0 m/s) cos 60.0^{\circ}=-2 m/s

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Energy is measured in watts and work is measured in joules. true or false?
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3 years ago
A 92.0-kg skydiver falls straight downward with an open parachute through a vertical height of 325 m. The skydiver’s velocity re
Alborosie

Answer:

The work done is 293.0kJ

Explanation:

<u>Data</u>

  • Mass:   m=92.0kg
  • height:    h=325m
  • acceleration due to gravity:  g=9.81m/s^{2}

Non conservative force act

The work is:

W=ΔKE+ΔPE

KE and PE means kinetic energy and potential energy respectively.

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Therefore

W=0+ΔPE

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3 years ago
A basketball player makes a jump shot. the 0.583 kg ball is released at a height of 1.80 m above the floor with a speed of 7.29
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The kinetic and potential energies must be taken into account.  The ball lost some speed but was also raised in the vertical direction between the two measured positions.  This will cost some of the kinetic energy that we don't want to ascribe to the air resistance losses.
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The loss in kinetic energy is
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One way to think about the potential energy part is that it is higher in the air at the hoop than when the player releases the ball.  In other words it hasn't fallen as far down as it went up, it is still in the process of gaining speed on the way down. This reduction in speed means less kinetic energy, but not because it was lost.  It will be gained once it falls to the height of 1.8m, minus the little loss it will experience over that distance due to air resistance.
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