Homework Statement
Consider four situations: I) a fan's rotation is speeding up while going in the clockwise direction; II) it is speeding up while going in the counterclockwise direction; III) it is slowing down while going in the clockwise direction; and IV) it is slowing down while going...
[b]1.
Consider a fan that has rotated by a total of 2 complete revolutions from where it started. This quantity (2 revolutions) is analogous to what quantity in linear kinematics?
Position
Displacement
Velocity
Speed
Time
Time
Homework Equations
I am...
Homework Statement
I am 65 kg and eat a 500 Calorie lunch and go hiking up a mountain afterwards. Assuming that chemical energy is converted to gravitational potential energy with 50% efficiency, approximately how many miles up the mountain can I go before I need my dinner?
0.5 miles...
Homework Statement
I push two frictionless carts along a table, using a force of 10 N on each. Riding on one cart is a squid and on the other cart is a mango. They have the same mass. The squid's cart is moving at 2.0 m/s when I start pushing, in the same direction that I push. The mango's...
Homework Statement
Let's say I tie a string to a clicker and swing it in a horizontal circle around my head at constant speed. How much work is done by the tension force due to the string when it goes all the way around one full circle?
A. No work is done.
B. The work equals the...
Homework Statement
A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight?
Very small but slightly greater than zero.
Zero.
Still 5000 N...
Homework Statement
Figure 5.18 shows a space station rotating about an axis. Because of the rotational motion, any object located at a point P on the interior surface of the station experiences a centripetal force directed toward the axis. The surface of the station provides this force by...
Homework Statement
If you suddenly multiplied the mass of Earth by a factor of 4, how would the period of a satellite change, if the radius of its orbit did not change?
4 times as long
1/4 as long
2 times as long
1/2 as long
Unchanged
Homework Equations
The...
Homework Statement
The model airplane in Figure 5.6 has a mass of 0.90 kg and moves at a constant speed on a circle that is parallel to the ground. The path of the airplane and its guideline lie in the same horizontal plane, because the weight of the plane is balanced by the lift generated...
Homework Statement
What is the period of Earth's (nearly) circular motion around the Sun?
(2*pi*r)/T
1 year
(1 year)/(2*pi)
(2*pi)/(1 year)
2*pi*(1 year)
Homework Equations
There is only one speed that a satellite can have if the satellite is to remain in...