Inquiry into Physics 7th Edition solutions

Inquiry into Physics 7
The quartz crystal used in an electric watch vibrates with a frequency of 32,768 Hz. What is the period of the crystals motion?

Inquiry into Physics 7
A piece of iron is heated with a torch to a temperature of 900 K. How much more energy does it emit as blackbody radiation at 900 K than it does at room temperature, 300 K?

Inquiry into Physics 7
16. As it orbits Earth, the 11,000-kg Hubble Space Telescope travels at a speed of 7,900 m/s and is 560,000 m above Earths surface. (a) What is its kinetic energy? (b) What is its potential energy?

Inquiry into Physics 7
A 0.1-kg ball is attached to a string and whirled around in a circle overhead. The string breaks if the force on it exceeds 60 N. What is the maximum speed the ball can have when the radius of the circle is 1 m?

Inquiry into Physics 7
Describe the four phases of matter. Compare their external, observable properties. Compare the nature of the forces between atoms or molecules (or both) in the solid, liquid, and gas phases.

Inquiry into Physics 7
A sprinter with a mass of 65 kg reaches a speed of 10 m/s during a race. Find the sprinters linear momentum. 2. Which has the larger linear momentum: a 2,000-kg houseboat going 5 m/s or a 600-kg speedboat going 20 m/s? 3. In Section 2.4, we computed the force needed to accelerate a 1,000-kg car from

Inquiry into Physics 7
A jet aircraft with a mass of 4,500 kg has an engine that exerts a force (thrust) equal to 60,000 N. (a) What is the jets acceleration when it takes off?(b) What is the jets speed after it accelerates for 8 s? (c) How far does the jet travel during the 8 s?

Inquiry into Physics 7
11. A motorist runs out of gas on a level road 200 m from a gas station. The driver pushes the 1,200-kg car to the gas station. If a 150-N force is required to keep the car moving, how much work does the driver do?

Inquiry into Physics 7
An astronaut working with many tools some distance away from a spacecraft is stranded when the maneuvering unit malfunctions. How can the astronaut return to the spacecraft by sacrificing some of the tools?

Inquiry into Physics 7
A yacht is 20 m long. Express this length in feet.

Inquiry into Physics 7
13 A weight lifter raises a 100-kg barbell to a height of 2.2 m. What is the barbells potential energy?

Inquiry into Physics 7
A hypnotists watch hanging from a chain swings back and forth every 0.8 s. What is the frequency of its oscillation?

Inquiry into Physics 7
A grain silo is filled with 2 million pounds of wheat. The area of the silos floor is 400 ft2 . Find the pressure on the floor in pounds per square foot and in psi.

Inquiry into Physics 7
A computer in a laboratory requires 2.50 ms to make a certain calcu- lation, as measured by a scientist in the lab. To someone moving past the lab at a relative speed of 0.995c, how long will the same cal- culation take?

Inquiry into Physics 7
Why do divers executing midair somersaults pull their legs in against their bodies?

Inquiry into Physics 7
A box-shaped metal can has dimensions 8 in. by 4 in. by 10 in. high. All of the air inside the can is removed with a vacuum pump. Assuming normal atmospheric pressure outside the can, find the total force on one of the 8-by-10-in. sides.

Inquiry into Physics 7
Two rectangular rugs are on display in a showroom. If one rug is twice as long as the other, does this necessarily mean that its area is also twice as large as that of the second? Explain.

Inquiry into Physics 7
Air molecules in a warm room (27C 300 K) typically have speeds of about 500 m/s (1,100 mph). Why is it that we are unaware of these fast-moving particles continuously colliding with our bodies?

Inquiry into Physics 7
A sports car is advertised to have a maximum cornering acceleration of 0.85 g. (a) What is the maximum speed that the car can go around a curve with a 100-m radius? (b) What is its maximum speed for a 50-m radius curve? (c) If wet pavement reduces its maximum cornering acceleration to 0.6 g, what do

Inquiry into Physics 7
What remains after a hydrogen atom is positively ionized?