Anytime a scientific theory is challenged does it mean that its not a good theory

A biologist is researching antibodies, which are tiny natural proteins in the blood of animals, and she is using methods developed twenty years ago.

Which of the following is a speed, not a velocity? A. 35 m/s east B. 0-35 m/s C. 035 m/s D. 35 m/s south

The motor, M, pulls on the cable with a force F = (10t2 + 300) N, where t is in seconds. If the 100 kg crate is originally at rest at t = 0, determine its speed when t = 4 s.

Suppose that 220 g mousetrap car had wheels 10.0 cm in diameter and an axle. 500 cm in diameter. for a car that is 60.0% efficient, find the minimum force exerted on the axle by the mousetrap necessary to move the car up a 20.0 degree incline.

What kind of energy is used when there is friction between two items?

Why do comets have tails?

The main characteristic of all vertebrates is the presence of a. cartilage b. a large brain c. a backbone d. an exoskeleton I got it. The answer was B

A projectile is thrown upward so that its distance above the ground after t seconds is h (t) equals negative 16 t squared plus 704 t. a) Find the maximum height the object reaches. b) Find the time it takes the object to reach the ground.

You are standing 100 meters from an object emitting a sound of constant intensity (loudness). You walk toward the source of sound until you are 20 meters from it. From your perspective, what has happened to the intensity of the sound?

What is the peak emf generated by a 0.250 m radius, 500-turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a uniform magnetic field. (This is 60 rev/s.)